Solid state assemblies of cyclic imides tethered hydroxy benzoic acids with pyridine and quinoline: Toward the formation of channels and cavities

Article abstract of DOI:10.1021/cg300342a

A series of inclusion compounds of different cyclic imides tethered hydroxy-benzoic acid hosts (1-8) with guests pyridine (I-IV) and quinoline (V-X) have been prepared and structurally characterized. Supramolecular aspects pertaining to the influence of guest molecules toward the formation of solid state network structures of hosts are described. Hydrogen bonding of both carboxylic acid and hydroxyl groups as well as π???π stacking of aromatic imide units led to the formation of channels of different dimensionalities in the supramolecular architectures of I-X. In these structures, the channels are occupied by the guest molecules that interact with both hydrogen bonding groups of host molecules via different types of hydrogen bond motifs. Thermogravimetric analyses correspond to the association of different numbers of guest pyridine or quinoline molecules with isomeric hydroxy-benzoic acid hosts. Solid state fluorescence spectra of hosts 1-8 are recorded which show emissions in the region of 412-516 nm. Overall this structural study represents the combined effects of π-stacking aromatic imide synthons and two hydrogen bonding carboxylic acid and hydroxyl functional groups in the presence of aromatic nitrogen containing guests to create fascinating supramolecular architectures.

Full text of DOI:10.1021/cg300342a

Article
pubs.acs.org/crystal
Solid State Assemblies of Cyclic Imides Tethered Hydroxy Benzoic
Acids with Pyridine and Quinoline: Toward the Formation of
Channels and Cavities
Devendra Singh and Jubaraj B. Baruah*
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039 Assam, India
S
* Supporting Information
ABSTRACT: A series of inclusion compounds of different cyclic imides tethered hydroxy-
benzoic acid hosts (1−8) with guests pyridine (I−IV) and quinoline (V−X) have been
prepared and structurally characterized. Supramolecular aspects pertaining to the influence of
guest molecules toward the formation of solid state network structures of hosts are described.
Hydrogen bonding of both carboxylic acid and hydroxyl groups as well as π···π stacking of
aromatic imide units led to the formation of channels of different dimensionalities in the
supramolecular architectures of I−X. In these structures, the channels are occupied by the
guest molecules that interact with both hydrogen bonding groups of host molecules via
different types of hydrogen bond motifs. Thermogravimetric analyses correspond to the
association of different numbers of guest pyridine or quinoline molecules with isomeric
hydroxy-benzoic acid hosts. Solid state fluorescence spectra of hosts 1−8 are recorded which
show emissions in the region of 412−516 nm. Overall this structural study represents the
combined effects of π-stacking aromatic imide synthons and two hydrogen bonding carboxylic acid and hydroxyl functional
groups in the presence of aromatic nitrogen containing guests to create fascinating supramolecular architectures.
pharmaceutical chemistry9 as well as in the synthesis of porous
INTRODUCTION
■
materials.10 In our recent reports, we have shown different
The directional properties of weak interactions are useful in
construction of self-assemblies.1 Hydroxyl and carboxylic acid
types of hydrogen bond motifs in inclusion compounds of
pyridine and quinoline with various bifunctional molecules that
contained both carboxylic acid group and aromatic imide π-
stacking unit.11a,b The structural investigation of few solvates of
other bifunctional molecules in which aromatic hydroxyl groups
are tethered by phthalimide and pyromellitic diimide units have
also shown interesting supramolecular architectures.11c
groups are the commonly used functional groups to construct
self-assemblies.2 The combination of hydroxyl and carboxylic
acid groups in aromatic compounds has been very useful in
making useful supramolecular assemblies.3 However, compli-
cacy in such system can be enhanced by adding other functional
groups such as imide groups that have also been used as
versatile scaffolds to design the new host−guest systems.4
Cyclic imides attached to aromatic rings possess a dipolar
nature, and this effect provides extra stability to the packing
arrangement.5 From this point of view, imides containing π-
stacking synthons such as naphthalimides or naphthalene
diimides combined with carboxylic acid or hydroxyl functional
groups draw special interest.6 These multifunctional molecules
create extended network solids by self-assembly through
hydrogen bonding interactions of the functional groups along
with the π···π stacking interactions of the naphthalimide rings.
Recently, Reger et al. have studied supramolecular structural
features of organic network solids as well as metal−organic
framework (MOF) type architectures derived from bifunctional
molecules that contained both a carboxylic acid and a π···π
stacking naphthalimide synthon, indicating the importance and
versatility of this supramolecular synthon.7
However, there is no systematic study carried out to ascertain
the role of directional interactions and the type of assemblies
that can be formed from trifunctional molecules containing
both hydroxyl and carboxylic acid groups tethered by a π-
stacking imide synthon. For this purpose we have chosen a few
phthalimide, naphthalimide, and naphthalene diimide deriva-
tives (Scheme 1) in which the carboxylic acid and hydroxyl
groups are attached at different positions of the aromatic ring
and studied the structures of their pyridine and quinoline
inclusion compounds. Such a study will not only provide
information on the assembling process but will also be able to
distinguish the deprotonation processes of the hydroxyl or
carboxylic acid groups to form their corresponding salt. Further,
analogous naphthalimide derivatives as used in this study have
interesting molecular recognition properties12 and will provide
a guideline on the formation of assemblies by such derivatives.
Besides that, supramolecular assemblies of hydroxyl group
containing compounds such as alcohols, phenols, and
carboxylic acids with pyridine or related nitrogen containing
aromatic compounds are well studied.8 Some of these either
lead to co-crystals or ionic salts which are useful in
Received: March 13, 2012
Revised: May 7, 2012
Published: May 8, 2012
© 2012 American Chemical Society
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Crystal Growth & Design
Article
dimethylformamide (15 mL) was refluxed for 5 h. The reaction
mixture was cooled to room temperature, poured into ice cooled water
(50 mL), and stirred for 15 min. A brown colored precipitate of the
product was formed, which was filtered and air-dried. Yield: 86%; IR
(KBr, cm−1): 3293 (s), 1720 (s), 1693 (s), 1623 (m), 1582 (s), 1499
(w), 1382 (m), 1293 (m), 1250 (s), 1208 (s), 824 (w), 780 (m), 665
Scheme 1. Structures of Host Molecules
1
(w). H NMR (400 MHz, DMSO-d6): 10.07 (s, 1H), 8.49 (m, 4H),
7.89 (t, 2H, J = 8.0 Hz), 7.48 (s, 1H), 7.26 (d, 1H, J = 8.4 Hz), 7.10 (d,
1H, J = 8.4 Hz). ESI-MS: 334.127 [M + H+].
4-(1,3-Dioxo-1H,3H-benzo[de]isoquinolin-2-yl)-3-hydroxy-benzoic
acid (4): Compound 4 was also obtained by the cyclo-condensation
reaction of 1,8-naphthalic anhydride and 4-amino-3-hydroxy-benzoic
acid with the similar procedure as used for 3. Yield: 84%; IR (KBr,
cm−1): 3397 (m), 1774 (w), 1737 (m), 1693 (s), 1651 (s), 1621 (s),
1589 (s), 1513 (w), 1437 (m), 1379 (m), 1358 (m), 1302 (w), 1270
(w), 1243 (s), 1121 (m), 1012 (w), 960 (w), 893 (w), 784 (m), 764
1
(m). H NMR (400 MHz, DMSO-d6): 10.11 (s, 1H), 8.51 (m, 4H),
7.90 (t, 2H, J = 7.6 Hz), 7.56 (s, 1H), 7.50 (d, 1H, J = 8.0 Hz), 7.10 (d,
1H, J = 8.4 Hz). ESI-MS: 334.106 [M + H+].
3-(1,3-Dioxo-1H,3H-benzo[de]isoquinolin-2-yl)-4-hydroxy-benzoic
acid (5): Compound 5 was synthesized by the cyclo-condensation
reaction of 1,8-naphthalic anhydride and 3-amino-4-hydroxy-benzoic
acid with the similar procedure as used for 3. Yield: 87%; IR (KBr,
cm−1): 3292 (s), 1774 (w), 1711 (s), 1698 (s), 1644 (m), 1608 (s),
1589 (m), 1510 (w), 1438 (w), 1376 (m), 1297 (m), 1270 (s), 1236
EXPERIMENTAL SECTION
■
Structure Determination. The X-ray single crystal diffraction
data were collected at 296 K with MoKα radiation (λ = 0.71073 Å)
using a Bruker Nonius SMART CCD diffractometer equipped with a
graphite monochromator. The SMART software was used for data
collection and also for indexing the reflections and determining the
unit cell parameters; the collected data were integrated using SAINT
software. The structures were solved by direct methods and refined by
full-matrix least-squares calculations using SHELXTL software.13 All
the non-H atoms were refined in the anisotropic approximation against
F2 of all reflections. The H-atoms, except those attached to nitrogen
and oxygen atoms, were placed at their calculated positions and refined
in the isotropic approximation. The H-atoms attached to nitrogen and
oxygen atoms were located in the difference Fourier maps and refined
with isotropic displacement coefficients in the structures I, II, IV, V,
VII, VIII, and X, whereas the H-atoms of O−H and N−H groups were
constrained in the case of structures III, VI, and IX. The disordered
guest pyridine or pyridinium and quinoline molecules were refined by
sharing two nitrogen atoms with two carbon atoms having half
occupancies at two opposite sites. Crystallographic data collection was
done at room temperature and the data are tabulated in Table 1.
Synthesis and Characterization of Compounds and Their
Solvates/Salts/Cocrystal. 2-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-5-
hydroxy-benzoic acid (1): A solution of phthalic anhydride (0.740 g, 5
mmol) and 2-amino-5-hydroxy-benzoic acid (0.765 g, 5 mmol) in
acetic acid (15 mL) was refluxed for 3 h. The reaction mixture was
cooled to room temperature, poured into ice cooled water (30 mL),
and kept for three days. Colorless crystals of the product were
obtained. Yield: 87%; IR (KBr, cm−1): 3274 (m), 1714 (s), 1615 (s),
1505 (m), 1463 (s), 1386 (s), 1336 (m), 1289 (s), 1241 (s), 1135
(m), 1108 (m), 933 (w), 884 (m), 843 (m), 793 (w), 749 (w), 719
1
(s), 1191 (w), 1013 (w), 778 (m), 662 (w). H NMR (400 MHz,
DMSO-d6): 10.61 (s, 1H), 8.49 (m, 4H), 7.89 (m, 4H), 7.07 (d, 1H, J
= 8.8 Hz). ESI-MS: 334.132 [M + H+].
5-hydroxy-2-[7-(2-carboxy-4-hydroxy-phenyl)-1,3,6,8-tetraoxo-
3,6,7,8-tetrahydro-1H-benzo [lmn] [3,8]phenanthrolin-2-yl]-benzoic
acid (6): A solution of 1,4,5,8-naphthalenetetracarboxylic dianhydride
(1.34 g, 5 mmol) and 2-amino-5-hydroxy-benzoic acid (1.530 g, 10
mmol) in N,N-dimethylformamide (20 mL) was refluxed for 3 h. The
reaction mixture was cooled to room temperature, poured into ice
cooled water (100 mL) and stirred for 15 min. A yellow colored
precipitate of the product was filtered and air-dried. Yield: 90%; IR
(KBr, cm−1): 3419 (m), 1736 (s), 1705 (s), 1657 (s), 1606 (m), 1583
(m), 1505 (w), 1454 (w), 1374 (m), 1361 (m), 1292 (w), 1260 (s),
1205 (s), 1154 (w), 1065 (w), 986 (w), 881 (w), 771 (m), 746 (m).
1H NMR (400 MHz, DMSO-d6): 10.17 (s, 2H), 8.73 (s, 4H), 7.52 (s,
2H), 7.33 (dd, 2H, J = 8.8 Hz), 7.15 (d, 2H, J = 8.4 Hz). ESI-MS:
584.112 [M + H+].
3-Hydroxy-2-[7-(4-carboxy-2-hydroxy-phenyl)-1,3,6,8-tetraoxo-
3,6,7,8-tetrahydro-1H-benzo [lmn][3,8]phenanthrolin-2-yl]-benzoic
acid (7): A red colored precipitate of the product 7 was obtained by
the cyclo-condensation reaction of 1,4,5,8-naphthalenetetracarboxylic
dianhydride and 4-amino-3-hydroxy-benzoic acid with the similar
procedure as used for 6. Yield: 90%; IR (KBr, cm−1): 3341 (m), 1712
(s), 1673 (s), 1603 (m), 1580 (m), 1426 (m), 1355(s), 1254 (s), 1113
(w), 981 (w), 950 (w), 885 (w), 839 (m), 768 (m), 751 (m), 704 (w).
1H NMR (400 MHz, DMSO-d6): 10.20 (s, 2H), 8.74 (s, 4H), 7.58 (s,
2H), 7.54 (d, 2H, J = 8.8 Hz), 7.46 (d, 2H, J = 8.0 Hz). ESI-MS:
584.124 [M + H+].
1
(m), 685 (w). H NMR (400 MHz, DMSO-d6): 10.22 (s, 1H), 7.95
(dd, 2H, J = 6.0 Hz), 7.88 (dd, 2H, J = 3.2 Hz), 7.45 (s, 1H), 7.32 (d,
1H, J = 8.4 Hz), 7.12 (d, 1H, J = 8.4 Hz). ESI-MS: 284.115 [M + H+].
4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3-hydroxy-benzoic acid (2):
A solution of phthalic anhydride (0.740 g, 5 mmol) and 4-amino-3-
hydroxy-benzoic acid (0.765 g, 5 mmol) in acetic acid (10 mL) was
refluxed for 3 h. The reaction mixture was cooled to room
temperature, poured into ice cooled water (30 mL), and stirred for
15 min. A brown colored crystalline material of the product was
obtained. This was filtered and dried in open air. Yield: 84%; IR (KBr,
cm−1): 3388 (s), 1732 (s), 1694 (s), 1599 (m), 1388 (s), 1289 (w),
1245 (m), 1208 (m), 1124 (m), 1103 (m), 1075 (m), 949 (w), 884
4-Hydroxy-2-[7-(3-carboxy-6-hydroxy-phenyl)-1,3,6,8-tetraoxo-
3,6,7,8-tetrahydro-1H-benzo[lmn][3,8]phenanthrolin-2-yl]-benzoic
acid (8): A pink colored precipitate of the product 8 was obtained by
the cyclo-condensation reaction of 1,4,5,8-naphthalenetetracarboxylic
dianhydride and 3-amino-4-hydroxy-benzoic acid with the similar
procedure as used for 6. Yield: 90%; IR (KBr, cm−1): 3300 (m), 1707
(s), 1668 (s), 1611 (s), 1582 (m), 1514 (w), 1451 (m), 1352(s), 1296
(m), 1260 (s), 1252 (s), 1212 (m), 1123 (w), 1087 (w), 985 (w), 841
1
(w), 768 (m), 648 (w). H NMR (400 MHz, DMSO-d6): 10.62 (s,
2H), 8.72 (s, 4H), 8.00 (s, 2H), 7.93 (d, 2H, J = 8.4 Hz), 7.09 (d, 2H, J
1
(m), 764 (w), 714 (m), 588 (w). H NMR (400 MHz, DMSO-d6):
= 8.8 Hz). ESI-MS: 584.095 [M + H+].
10.31 (s, 1H), 7.98 (dd, 2H, J = 3.2 Hz), 7.91 (dd, 2H, J = 3.2 Hz),
7.56 (s, 1H), 7.50 (d, 1H, J = 8.4 Hz), 7.40 (d, 1H, J = 8.4 Hz). ESI-
MS: 284.056 [M + H+].
2-(1,3-Dioxo-1H,3H-benzo[de]isoquinolin-2-yl)-5-hydroxy-benzoic
acid (3): A solution of 1,8-naphthalic anhydride (0.990 g, 5 mmol)
and 2-amino-5-hydroxy-benzoic acid (0.765 g, 5 mmol) in N,N-
I: I was obtained by crystallization of compound 1 from pyridine
solution as colorless crystals. IR (KBr, cm−1): 3461 (m), 1764 (w),
1714 (s), 1631 (m), 1552 (m), 1490 (m), 1463 (m), 1391 (s), 1289
(s), 1240 (s), 1117 (m), 1087 (w), 990 (w), 887 (m), 757 (m), 718
(m), 687 (w). H NMR (400 MHz, DMSO-d6): 10.21 (s, 1H), 8.56
(d, 2H, J = 3.6 Hz), 7.96 (dd, 2H, J = 2.8 Hz), 7.89 (dd, 2H, J = 2.8
1
3170
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Crystal Growth & Design
Article
Table 1. Crystallographic Parameters of I−X
compound no.
formulas
I
II
III
C29H19N3O5
IV
V
C20H14N2O5
(C15H8NO5·C5H6N)
C53H37N5O10
(C38H21N2O10·2C5H5N·C5H6N)
903.89
triclinic
P1
C43H37N5O14
(C28H14N2O10·3C5H5N·4H2O)
847.78
triclinic
P1
C24H18N2O6
(C15H8NO5·C9H8N·H2O)
430.12
triclinic
P1
(C19H11NO5·C10H8N2)
489.47
triclinic
P1
formula wt
crystal system
space group
a (Å)
362.33
triclinic
P1
̅
̅
̅
̅
̅
8.0305(3)
8.0978(4)
14.9519(9)
93.677(3)
91.105(3)
117.764(2)
857.27(7)
2
9.3051(3)
9.3350(3)
13.7530(4)
98.580(2)
101.655(2)
96.513(2)
1144.12(6)
1
9.5761(4)
11.3729(4)
12.5759(5)
66.664(2)
79.047(2)
66.456(2)
1152.07(8)
2
8.4869(7)
8.8222(8)
14.4413(13)
105.395(6)
102.230(6)
97.442(6)
998.81(15)
1
8.1871(2)
9.4937(2)
14.0258(3)
72.9640(10)
80.8580(10)
73.4710(10)
995.86(4)
2
b (Å)
c (Å)
α (°)
β (°)
γ (°)
V (Å3)
Z
density/Mg m−3 1.404
abs coeff /mm−1 0.103
1.309
1.411
1.403
1.397
0.092
0.098
0.107
0.101
F(000)
376
468
508
438
435
total no. of
reflections
12013
14915
12572
9249
9805
reflections, I >
2σ(I)
2604
3233
3157
1503
2706
max (2θ°)
50.00
50.00
50.00
41.86
50.00
ranges (h, k, l)
−9 ≤ h ≤ 9
−9 ≤ k ≤ 8
−17 ≤ l ≤ 17
97.6
−11 ≤ h ≤ 11
−11 ≤ k ≤ 11
−15 ≤ l ≤ 16
99.4
−11 ≤ h ≤ 11
−13 ≤ k ≤ 13
−14 ≤ l ≤ 14
97.2
−8 ≤ h ≤ 8
−8 ≤ k ≤ 8
−14 ≤ l ≤ 14
99.4
−8 ≤ h ≤ 9
−11 ≤ k ≤ 11
−16 ≤ l ≤ 16
91.3
complete to 2θ
(%)
data/restraints/
parameters
GOF (F2)
2950/0/249
3995/0/326
3945/0/336
2114/0/310
3208/0/294
1.034
1.045
1.080
1.033
1.044
R indices [I > 2σ 0.0366
(I)]
0.0474
0.0435
0.0564
0.0362
R indices (all
0.0408
0.0567
0.0542
0.0812
0.0432
data)
compound no.
formulas
VI
VII
VIII
IX
X
C33H23N3O5
(C15H9NO5.2C9H7N)
C83H57N7O10
(2C28H18N2O5.3C9H7N)
C28H18N2O5
(C19H10NO5.C9H8N)
C82H56N8O10
(C28H14N2O10.6C9H7N)
C91H63N9O10
(C28H14N2O10.7C9H7N)
formula wt
crystal system
space group
a (Å)
541.54
1312.38
monoclinic
P21/c
462.44
1313.35
triclinic
1442.53
triclinic
monoclinic
P21/c
monoclinic
P21/c
P1
P1
̅
̅
12.8111(5)
28.4327(11)
7.3022(3)
90.00
9.3707(18)
19.583(4)
18.346(4)
90.00
9.2947(7)
15.4314(12)
15.7079(11)
90.00
9.5272(6)
13.2380(9)
13.3281(9)
95.328(3)
97.809(4)
93.357(3)
1653.85(19)
1
7.9780(7)
10.9945(9)
22.1724(18)
76.991(5)
84.185(6)
86.845(6)
1884.1(3)
1
b (Å)
c (Å)
α (°)
β (°)
γ (°)
V (Å3)
95.295(2)
90.00
99.264(10)
90.00
95.373(4)
90.00
2648.51(18)
3322.7(12)
2
2243.1(3)
4
Z
4
density/Mg m−3 1.358
abs coeff /mm−1 0.093
1.313
1.369
1.319
1.270
0.087
0.095
0.088
0.084
F(000)
1128
1370
960
684
751
total no. of
reflections
34678
43094
29702
21948
30847
reflections, I >
2σ(I)
3542
3883
2802
4353
3076
max (2θ°)
50.00
47.18
50.00
50.00
50.00
ranges (h, k, l)
−15 ≤ h ≤ 14
−31 ≤ k ≤ 33
−8 ≤ l ≤ 8
99.8
−10 ≤ h ≤ 10
−22 ≤ k ≤ 21
−20 ≤ l ≤ 20
98.8
−11 ≤ h ≤ 11
−17 ≤ k ≤ 18
−18 ≤ l ≤ 18
100.0
−11 ≤ h ≤ 11
−15 ≤ k ≤ 15
−15 ≤ l ≤ 15
99.4
−9 ≤ h ≤ 9
−13 ≤ k ≤ 13
−25 ≤ l ≤ 26
98.8
complete to 2θ
(%)
data/restraints/
parameters
GOF (F2)
4659/0/372
4916/0/468
3944/0/321
5810/0/453
6565/0/511
1.029
1.034
1.017
1.031
1.164
R indices [I > 2σ 0.0399
(I)]
0.0428
0.0470
0.0421
0.0783
3171
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Crystal Growth & Design
Article
Table 1. continued
compound no.
I
II
III
IV
V
R indices (all
0.0591
0.0559
0.0698
0.0584
0.1690
data)
Hz), 7.78 (t, 1H, J = 7.6 Hz), 7.43 (s, 1H), 7.38 (t, 2H, J = 7.6 Hz),
7.30 (d, 1H, J = 8.8 Hz), 7.10 (d, 1H, J = 8.4 Hz).
(d, 6H, J = 8.0 Hz), 8.00 (dd, 12H, J = 8.4 Hz), 7.76 (t, 6H, J = 8.0
Hz), 7.59 (t, 6H, J = 8.0 Hz), 7.33 (m, 8H), 7.32 (d, 2H, J = 8.4 Hz),
7.15 (d, 2H, J = 8.8 Hz).
II: The crystals of II were obtained as colorless plates from a
solution of compound 3 in pyridine. IR (KBr, cm−1): 3294 (m), 1719
(s), 1694 (s), 1651 (s), 1624 (m), 1591 (m), 1500 (w), 1438 (w),
1381 (m), 1361 (m), 1292 (m), 1248 (s), 1208 (s), 1065 (w), 823
X: The solvate X was obtained from a solution of compound 8 in
quinoline and pyridine after three days as yellow blocks. IR (KBr,
cm−1): 3434 (m), 1712 (s), 1681 (s), 1606 (s), 1581 (s), 1504 (m),
1447 (m), 1374 (m), 1346 (s), 1301 (s), 1248 (s), 1123 (m), 1082
1
(w), 781 (m), 750 (m). H NMR (400 MHz, DMSO-d6): 10.07 (s,
1
(m), 981 (w), 949 (w), 810 (m), 784 (m), 765 (m). H NMR (400
1H), 8.57 (d, 3H, J = 2.8 Hz), 8.50 (t, 4H, J = 7.6 Hz), 7.90 (t, 2H, J =
7.6 Hz), 7.78 (t, 2H, J = 7.2 Hz), 7.49 (s, 1H), 7.38 (t, 3H, J = 6.0 Hz),
7.27 (d, 1H, J = 8.4 Hz), 7.11 (d, 1H, J = 8.0 Hz).
MHz, DMSO-d6): 10.56 (s, 2H), 8.90 (d, 7H, J = 2.8 Hz), 8.51 (s,
4H), 8.50 (s, 2H), 8.36 (d, 7H, J = 7.6 Hz), 8.00 (dd, 14H, J = 8.0 Hz),
7.89 (t, 7H, J = 8.0 Hz), 7.76 (t, 7H, J = 7.6 Hz), 7.61 (t, 7H, J = 7.2
Hz), 7.52 (dd, 2H, J = 4.0 Hz), 7.07 (d, 2H, J = 8.4 Hz).
III: A solution of compound 4 in pyridine and a solution of bpy in
ethanol were mixed together in a 1:1 ratio; red block crystals of III
were obtained after 15 days from the solution. IR (KBr, cm−1): 3444
(m), 1774 (w), 1737 (m), 1688 (s), 1650 (s), 1589 (s), 1437 (m),
1378 (m), 1357 (m), 1243 (s), 1120 9 m), 1013 (m), 959 (w), 897
RESULTS AND DISCUSSION
■
Eight different cyclic imides tethered by aromatic hydroxy
carboxylic acids, 1−8, were synthesized by condensation
reactions of different cyclic anhydrides with corresponding
amino hydroxy benzoic acids (Scheme 1). Crystallization of
compounds 1, 3, and 7 with pyridine solvent led to the
formation of crystals of pyridine inclusion compounds (I, II,
and IV). The pyridine included crystals of 4 could not be
obtained under the similar crystallization conditions; however,
when we added 4,4′-bipyridine (bpy) in a pyridine solution of
4, we obtained cocrystal of compound 4 with bpy in a 1:1
host−guest ratio. Host−guest ratios of all these crystalline
materials are shown in Scheme 2. Different types of hydrogen
1
(w), 815 (m), 782 (m), 764 (m). H NMR (400 MHz, DMSO-d6):
10.13 (s, 1H), 8.71 (s, 4H), 8.50 (d, 4H, J = 7.6 Hz), 7.90 (t, 2H, J =
7.6 Hz), 7.80 (s, 4H), 7.56 (s, 1H), 7.50 (d, 1H, J = 8.0 Hz), 7.38 (d,
1H, J = 8.4 Hz).
IV: Compound 7 was dissolved in pyridine and left undisturbed for
seven days. The crystals of IV were obtained as red blocks. IR (KBr,
cm−1): 3430 (m), 1714 (m), 1673 (s), 1582 (m), 1426 (m), 1358 (s),
1255 (s), 1214 (m), 1200 (m), 1092 (w), 981 (w), 949 (w), 883 (w),
1
840 (w), 768 (m), 753 (m). H NMR (400 MHz, DMSO-d6): 10.19
(s, 2H), 8.74 (s, 4H), 8.57 (s, 6H), 7.74 (t, 3H, J = 7.2 Hz), 7.59 (s,
2H), 7.54 (d, 2H, J = 8.4 Hz), 7.46 (d, 2H, J = 8.0 Hz), 7.37 (s, 6H).
V: V was crystallized as colorless blocks from the quinoline solution
of compound 1. IR (KBr, cm−1): 3454 (m), 1766 (w), 1707 (s), 1593
(m), 1504 (m), 1451 (m), 1396 (s), 1290 (m), 1246 (s), 1112 (m),
1016 (w), 892 (w), 808 (w), 726 (m), 611 (w). 1H NMR (400 MHz,
DMSO-d6): 10.20 (s, 1H), 8.90 (s, 1H), 8.36 (d, 1H, J = 7.6 Hz), 7.97
(m, 4H), 7.76 (t, 2H, J = 7.2 Hz), 7.61 (t, 1H, J = 6.8 Hz), 7.53 (dd,
2H, J = 4.0 Hz), 7.42 (s, 1H), 7.30 (d, 1H, J = 8.4 Hz), 7.10 (d, 1H, J =
8.8 Hz).
Scheme 2. Host-Guest Complexes of Imides with Pyridine/
Bipyridine Showing Host-Guest Stoichiometry
VI: The solvate VI was also crystallized as colorless blocks from the
quinoline solution of compound 2. IR (KBr, cm−1): 3453 (m), 1780
(w), 1726 (s), 1708 (s), 1646 (m), 1596 (m), 1505 (w), 1382 (s),
1291 (m), 1228 (m), 1103 (w), 946 (w), 884 (w), 772 (m), 713 (m).
1H NMR (400 MHz, DMSO-d6): 10.30 (s, 1H), 8.90 (s, 2H), 8.37 (d,
2H, J = 8.0 Hz), 8.00 (m, 4H), 7.91 (dd, 4H, J = 2.8 Hz), 7.76 (t, 2H, J
= 8.0 Hz), 7.61 (t, 2H, J = 8.0 Hz), 7.56 (s, 1H), 7.52 (dd, 2H, J = 4.0
Hz), 7.48 (d, 1H, J = 7.6 Hz), 7.40 (d, 1H, J = 8.0 Hz).
VII: The solvate VII was obtained from a solution of compound 3
in quinoline and pyridine after seven days as brown colored blocks. IR
(KBr, cm−1): 3295 (m), 1716 (s), 1693 (s), 1655 (s), 1624 (m), 1591
(m), 1582 (s), 1498 (w), 1440 (w), 1385 (m), 1296 (m), 1250 (s),
1208 (s), 1067 (w), 856 (w), 793 (m), 723 (m). 1H NMR (400 MHz,
DMSO-d6): 10.07 (s, 1H), 8.91 (s, 2H), 8.50 (t, 4H, J = 7.2 Hz), 8.36
(d, 2H, J = 8.4 Hz), 8.01 (dd, 4H, J = 8.4 Hz), 7.90 (t, 2H, J = 8.4 Hz),
7.76 (t, 2H, J = 6.8 Hz), 7.61 (t, 2H, J = 8.0 Hz), 7.54 (dd, 2H, J = 4.4
Hz), 7.49 (s, 1H), 7.27 (d, 1H, J = 8.8 Hz), 7.11 (d, 1H, J = 8.8 Hz).
VIII: VIII was obtained by crystallization of compound 5 from
quinoline solution as brown block crystals. IR (KBr, cm−1): 3445 (m),
1698 (s), 1662 (s), 1589 (s), 1501 (m), 1434 (m), 1355 (s), 1291
(m), 1241 (s), 889 (w), 849 (w), 809 (m), 787 (m), 735 (w), 670 (w).
1H NMR (400 MHz, DMSO-d6): 10.63 (s, 1H), 8.90 (d, 2H, J = 2.8
Hz), 8.72 (s, 1H), 8.42 (d, 2H, J = 7.6 Hz), 7.88 (m, 5H), 7.76 (t, 2H,
J = 7.2 Hz), 7.61 (t, 1H, J = 7.6 Hz), 7.52 (dd, 2H, J = 4.4 Hz), 7.10
(d, 1H, J = 8.4 Hz).
bond motifs observed between the guest and multifunctional
host molecules in the structures of I−IV are shown in Figures
1−4 along with their three-dimensional (3D) supramolecular
architectures. The hydrogen bond parameters for the structures
I−IV are listed in Table S1 (Supporting Information).
Intermolecular interactions between the guest pyridine/bpy
and −COOH/−OH groups of host molecules lead to the
formation of either salt or solvate or cocrystal. Various types of
intermolecular hydrogen bonding interactions are found to
responsible for the formation of channels filled by guest
molecules in all these host−guest 3D supramolecular structures.
IX: A solution of compound 6 in pyridine and quinoline resulted in
the formation of crystals of solvate IX as red blocks. IR (KBr, cm−1):
3444 (m), 1706 (s), 1667 (s), 1530 (m), 1363 (s), 1289 (m), 1256
1
(s), 1222 (m), 1146 (w), 1124 (w), 771 (m). H NMR (400 MHz,
DMSO-d6): 10.16 (s, 2H), 8.90 (d, 6H, J = 2.8 Hz), 8.71 (s, 4H), 8.36
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Single crystal X-ray structure analysis reveals that compound
cation, which appears as its half in the asymmetric unit, is
disordered across an inversion center sharing the nitrogen and
carbon atoms at the 1 and 4 positions of the pyridine ring with
half occupancies. The hydrogen atom attached to the
carboxylate group of host molecule is also disordered and
shared between the two same oxygen atoms of two carboxylate
groups by O2−H2···O2 interaction (Figure 2a). The hydrogen
I crystallized in the triclinic P1 space group, and its
̅
crystallographic asymmetric unit consists of one molecule of
host anion 1 and one guest pyridinium cation. In the crystal
lattice of I, guest pyridinium molecule interacts with the
carboxylate group of the host molecule via discrete donor N2−
H2···O2 interaction and with the −OH group of the host
molecule via discrete donor C16−H16···O3 interaction (Figure
1a). Simultaneously, another oxygen atom of carboxylate group
Figure 2. (a) Weak interactions in the host−guest assembly of II. (b)
Formation of 3D channel architecture where 2D separated layers of
host molecules (green) are sustained by C−H···π interactions
containing pyridinium cations and pyridine molecules (red and
blue) inside the channels (along the a-axis). (c) Space filling model
after removal of guest molecules inside the channels.
Figure 1. (a) A part of crystal structure showing host−guest weak
interactions in I. (b) Channel formation in the assembly of host (red)
and guest (blue) molecules (along the a-axis). (c) Space filling model
after removal of pyridine molecules inside the channels.
atom located on disordered pyridinium cation is also shared
with this oxygen atom by N2−H26···O2 interaction which also
participates in bifurcated donor hydrogen bonding and further
interacts with another oxygen atom of the carboxylate group by
N2−H26···O1 interaction. The guest pyridine molecule also
interacts with the carboxylate group, −OH group, and carbonyl
oxygen atom of the host molecule by donor−acceptor C21−
H21···O2, O3−H3A···N3, and C20−H20···O4 interactions,
respectively. The host molecules also assemble in the lattice by
C11−H11···O5 and C15−H15···O4 interactions which exist
between the carbonyl oxygen atoms and naphthalimide rings.
These interactions result in the construction of 2D layers of
host molecules containing channels of approximate 11 × 9 Å
dimensions in the lattice. The 2D layers are further connected
to each other via C−H···π (dC5...π 3.54 Å) interactions creating
a 3D host−guest architecture of II in the crystal lattice (Figure
2b). The channels formed inside the 2D layers of the host
molecules are filled by both guest pyridinium cations and
pyridine molecules as viewed along the a-axis (Figure 2b,c).
Earlier in the case of pyridine solvates of various naphthalimide
tethered carboxylic acids, we have demonstrated that the guest
molecule interacts with the host molecule either making a cyclic
participates in bifurcated acceptor hydrogen bonding with the
−OH group and aromatic ring bearing carboxylate and −OH
group of another host molecule via O3−H3A···O1 and C5−
H5···O1 interactions. These interactions make an assembly of
3
two host and one guest molecules forming two different R3 (9)
1
and R2 (6) cyclic hydrogen motifs in the lattice. Further, one of
the carbonyl oxygen atoms of the host molecule is also involved
in bifurcated acceptor hydrogen bonding with a guest molecule
via two C−H···O interactions, namely, C17−H17···O5 and
C19−H19···O5 interactions. Another carbonyl oxygen interacts
with the aromatic imide ring of the host molecule through
C12−H12···O4 interaction. Besides that, π···π interactions
between the aromatic rings of host and guest molecules are also
observed in the hydrogen bonded assembly of I. All these
host−guest interactions construct a 3D supramolecular layered
architecture containing channels of approximate 11 × 6 Å
dimensions in the crystal lattice of I. The channels formed
among the two-dimensional (2D) layers of host molecules are
filled by guest pyridine molecules as viewed along the a-axis
(Figure 1b,c). These channels are constructed by tetrameric
assemblies of host molecules and extend along the crystallo-
graphic a-axis.
2
R2 (7) hydrogen bond motif or via a discrete O−H...N
interaction.11a
The cocrystal III crystallized in the triclinic P1 space group
̅
The compound II crystallized in triclinic P1 space group,
and possesses one molecule of host 1 and one molecule of
guest bpy in its crystallographic asymmetric unit. In the
structure of III, the guest bpy molecule loses its planarity, and
both the aromatic rings are twisted at an angle of 32° with
̅
asymmetric unit of this has one-half of the centrosymmetric
(3···H···3)− host anion with one guest pyridine molecule and
half of the guest pyridinium cation. The guest pyridinium
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respect to each other. The guest bpy molecule is found to
associate with host molecules via both donor and acceptor
host−guest interactions (Figure 3a). Both the nitrogen atoms
solvent water in its crystallographic asymmetric unit. The guest
pyridine molecule, which appears as its half in the asymmetric
unit, is disordered across an inversion center and disposed in
the lattice such that the nitrogen and carbon atoms at 1 and 4
positions of the pyridine rings are shared with half occupancies
(Figure 4a). This symmetric arrangement produces two sets of
Figure 3. (a) Weak interactions among the host and guest bpy
molecules in III. (b) Crystal packing arrangement showing 3D
channels along the b-axis. (c) Space filling model after omission of
guest bpy (red) molecules inside the channels.
Figure 4. (a) Host−guest weak interactions forming a 1D supra-
molecular cavity in the structure of IV. (b) Formation of 3D channels
(along the c-axis) containing guest pyridine and water molecules inside
the channels in the supramolecular architecture of IV. (c) Space filling
model after removal of guest molecules inside the channels.
of bpy interact with −COOH and −OH functional groups of
host molecule via acceptor O2−H2···N2 and O3−H3···N3
interactions and its aromatic ring also interacts with the
naphthalimide ring of the host molecule via acceptor C−H···π
(dC15...π 3.57 Å) interaction. The aromatic rings of guest bpy
molecule are also found to display four different donor
hydrogen bonds with host molecule, namely, C20−H20···O2
and C24−H24···O5 interactions with −COOH group and
symmetry nonequivalent guest pyridine (total three) and two
sets of symmetry independent water molecules (total four) in
the lattice. One set of lattice water molecules interacts with the
−COOH and −OH groups of the host molecule via donor−
acceptor O6−H6A···O1 and O3−H3A···O6 interactions and
assemble two host and two lattice water molecules in a 1D
layered arrangement forming repeated supramolecular cavities
in the lattice. The cavities that formed along the a-axis contain
disorder pyridine (from one set) and another set of water
molecules interacting with each other via N5−H20A···O7
interactions. No interactions between the host molecules or
same guest molecules are observed in the crystal lattice of IV.
Another set of guest pyridine molecules are associated with the
−COOH group of host molecules by a combination of donor−
acceptor C19−H19···O1 and O2−H2···N2 interactions making
2
carbonyl oxygen making a cyclic R2 (16) hydrogen bond motif,
another C26−H26···O3 interaction with the −OH group, and
C28−H28···π (dC28...π 3.50 Å) interaction with the aromatic
ring of the host molecule. Moreover, the π···π interactions
between the naphthalimide ring of the host molecule and one
of the aromatic rings of the guest molecule are also observed in
the lattice. No interactions between the guest molecules are
observed; however, the host molecules are found to interact
with each other by a combination of two similar C3−H3A···O1
interactions between the oxygen atom of the −COOH groups
and the hydrogen atom of the aromatic ring, forming a cyclic
2
R2 (10) motif in the lattice. Strong π···π contact between the
naphthalimide rings of host molecules are also observed in the
hydrogen bonded network of III. All the intermolecular host−
host and host−guest hydrogen bond interactions can be taken
in account for the construction of a 3D supramolecular channel
network of III in the crystal lattice. The channels of
approximate 16 × 10 Å dimensions are created by repeated
3D hexameric assemblies of host molecules. The guest
molecules are encapsulated inside these assemblies filling the
channels as viewed along the b-axis (Figure 3b,c). Bipyridine or
terpyridines have been used to make porous building blocks
with aromatic carboxylic acids.14
2
cyclic R2 (7) hydrogen bond motifs and further interacts with
the −OH and carbonyl group of host molecules through donor
C18−H18···O3 and C17−H17···O5 interactions. These
interactions assemble the one-dimensional (1D) layers into a
3D supramolecular host−guest network. The 3D network
created by host−guest interactions also form channels of
approximate 16 × 6 Å dimensions in the lattice along the c-axis.
These channels created between the 3D layers of host
molecules are filled by both sets of guest water and pyridine
molecules (Figure 4b,c). We have also shown earlier that
different orientations of the weak interactions lead to
polymorphic structures in pyridine solvates of naphthalene
diimide tethered carboxylic acids.11b
The solvate IV crystallized in the triclinic P1 space group and
̅
included a half molecule of 7 lying on the inversion center, one
and half molecules of guest pyridine, and two molecules of
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Powder X-ray diffraction (PXRD) patterns of all these host−
guest crystalline materials are recorded, which are almost the
same as that simulated patterns from the single-crystal data,
revealing the phase purity of the bulk samples (Figures S1−S4,
Supporting Information). To examine the host−guest ratios in
the pyridine inclusion compounds, thermogravimetric analyses
(TGA) are carried out (Figures S11−S13, Supporting
Information). TGA curve of I shows one-step weight loss of
20.7% weight in the temperature range 95−150 °C corresponds
to one equivalent of pyridine molecule (calcd 21.8%).
Compound II loses 27.6% weight in two steps between 85
and 140 °C, which corresponds to the loss of one and half
equivalent of pyridine molecules (calcd 26.3%). In solvate IV,
the weight loss between 25 and 55 °C is accounted for by the
loss of lattice water molecules; a further 29.4% weight loss
corresponds to three equivalents of pyridine molecules,
occurring from IV in the temperature range 90−160 °C
(calcd 30.5%).
Crystal structures of six quinoline inclusion compounds (V−
X) of different cyclic imides were also determined. The host−
guest stoichiometries of these compounds are depicted in
Scheme 3. The guest quinoline molecules are found to associate
Scheme 3. Various Inclusion Compounds of Quinoline
Showing Host−Guest Ratio
Figure 5. (a) Host−guest interactions leading to the formation of a
cavity containing guest molecules (along the a-axis) in the structure of
V. (b) Construction of a 2D host−guest channel network in the lattice
(along the b-axis). (c) Space filling model after removal of guest
quinolinium (blue) and water (red) molecules inside the channels.
molecules form bifurcated hydrogen bonds with the aromatic
rings of host molecules via C5−H5···O6 and C11−H11···O6
interactions. The guest quinolinium molecules interact with the
2
carboxylate groups of host molecules to make R2 (7) motifs via
N2−H2···O1 and C16−H16···O2 interactions and also come
in contact with −OH groups via weak C16−H16···O3
hydrogen bonds inside these cavities. The quinolinium
molecules further interact with host molecules through C21−
H21···O4 and π···π interactions, constructing a 2D channel
architecture of host molecules in the lattice. These 2D channels
of approximate 11 × 10 Å dimensions are occupied by guest
molecules as viewed along the b-axis (Figure 5b,c).
with host molecules via different types of weak interactions in
the structures of V−X (Figures 5−10). The supramolecular
architectures of these various structures create different types of
channels in their crystal lattices which are filled by guest
molecules. The hydrogen bond parameters for the structures
V−X are listed in Table S2 in Supporting Information.
Crystal structure analysis revealed that compound V
The solvate VI crystallized in monoclinic P21/c space group
and involves one molecule of host 2 and two symmetry
nonequivalent guest quinoline molecules in the crystallographic
asymmetric unit. One of the symmetry nonequivalent quinoline
molecules interacts with the −COOH of group host molecule
via discrete O2−H2···N2 interaction (Figure 6a). The hydro-
gen atom of this quinoline ring also forms a bifurcated donor
hydrogen bond with the carbonyl oxygen atom and aromatic
ring of host molecule via C17−H17···O4 and C−H···π (dC17...π
3.65 Å) interactions. Another symmetry nonequivalent quino-
line molecule is found to associate with −OH and carbonyl
groups of host molecule by a combination of acceptor O3−
H3A···N3 and donor C25−H25···O5 interactions making a
crystallized in the triclinic P1 space group, and its crystallo-
̅
graphic asymmetric unit contains one molecule of host anion 1,
one guest quinolinium cation, and one lattice water molecule.
In the crystal lattice of V, the host molecules associate with
each other through a set of two O3−H3A···O2 interactions
between the carboxylate and −OH functional groups which
2
produce R2 (14) motifs in the lattice (Figure 5a). One of the
carbonyl oxygen atoms of host molecules interacts with
aromatic imide rings via C11−H11···O5 interactions. This
arrangement of weak interactions leads to the formation of 1D
cavities along the a-axis involving four host molecules in such a
cavity. The guest water and quinolinium molecules are held in
these cavities by weak interactions. The oxygen atoms of water
2
cyclic R2 (10) motif in the lattice. This quinoline also interacts
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Figure 6. (a) Intermolecular interactions between the host and two
symmetry independent guest molecules in VI. (b) Formaton of 3D
supramolecular channel architecture by the combination of host
molecules and one set of symmetry independent guest molecules
(along the c-axis). (c) Space filling model after removal of another set
of guest quinoline molecules inside the channels.
Figure 7. (a) A part of the crystal structure of VII showing different
types of weak interactions between the host and three symmetry
independent quinoline molecules. (b) Channel formation in the
assembly of host and quinoline molecules (along the c-axis). (c) Space
filling model after removal of first and second set of quinoline
molecules inside the channels.
with the aromatic ring of the host molecule bearing −COOH
and −OH groups via C−H···π (dC27...π 3.61 Å) interaction.
Moreover, C−H···π (dC20...π 3.69 Å) interactions between the
two different sets of symmetry nonequivalent guest molecules
and π···π interactions between the same set of guest molecules
are also observed in the lattice. Beside that, the host molecules
interaction and with both the carbonyl oxygen atoms of the
host molecule via donor C29−H29···O5 and C36−H36···O9
interactions. The disorder quinoline molecule (third set)
interacts with the host molecule via bifurcated acceptor C−
H···π (dC22...π 3.65 Å and 3.49 Å) interactions. Beside these
host−guest interactions, the host molecules also interact with
each other in the lattice via C11−H11···O5 and C15−
H15···O4 and C−H···π (dC16...π 3.62 Å) interactions. Strong
π···π interaction between the first set of quinoline molecules
and between the first and second set of quinoline molecules are
also observed in the crystal lattice. These interactions give rise
to a 3D supramolecular host−guest assembly creating channels
of approximate 10 × 5 Å dimensions in the lattice as viewed
along the c-axis. The channels are formed by the combinations
of host and disordered quinoline molecules, containing other
two sets of quinoline molecules inside these channels (Figure
7b,c).
2
also assemble together to create a cyclic R2 (12) motif in the
lattice via edge to face C6−H6···O4 interactions. All the above-
described host−host, host−guest, and guest−guest interactions
affect the construction of a 3D supramolecular structure
creating channels of approximate 11 × 9 Å dimensions in the
crystal lattice of VI. These channels are constructed by the
combination of host and one set of symmetry independent
guest molecules in the separated 2D host−guest layers and
accommodate another independent set of guest molecules
inside them as viewed along the c-axis (Figure 6b,c).
The solvate VII crystallized in the monoclinic P21/c space
group; its crystallographic asymmetric unit consists of one
molecule of host 3 and two and half guest quinoline molecules.
The guest quinoline molecule, which appears as its half in the
asymmetric unit, is disordered and maintains a symmetric
structure with respect to an inversion center. The disordered
structure is formed by sharing two nitrogen atoms with half
occupancies with two carbon atoms at two opposite sites. This
arrangement makes three symmetry nonequivalent quinoline
molecules in the asymmetric unit which interact with the host
molecule via different types of interactions (Figure 7a). The
hydrogen atom attached to the −COOH group of the host
molecule is also disordered and shared with one set of
symmetry independent (first set) guest quinoline molecules via
O1−H1···N2 interaction. The first set of quinoline molecules
further interacts with another oxygen atom of the −COOH
group and oxygen atom of the −OH group via donor C20−
H20···O2 and C26−H26···O3 interactions and also shows a
bifurcated donor C−H···π (dC22...π 3.73 Å and 3.67 Å)
interaction with the naphthalimide ring of the host molecule.
The second set of quinoline molecule interacts with the −OH
group of the host molecule via acceptor O3−H3A···N3
The compound VIII crystallized in the monoclinic P21/c
space group, containing one molecule of host anion 5 and one
guest quinolinium cation in its crystallographic asymmetric
unit. The hydrogen atom attached with a guest quinolinium
molecule acts as a disordered hydrogen in the structure of VIII
and is shared with the carboxylate group of the host molecule
via N2−H2···O2 interaction (Figure 8a). Another oxygen atom
of the carboxylate group of the host molecule forms a
intermolecular bifurcated acceptor hydrogen bond with the
aromatic ring of another host molecule by the combination of
O3−H3A···O2 and C4−H4···O1 interactions generating a
1
R2 (6) motif in the lattice. Carbonyl groups and naphthalimide
rings of the host molecules also interact with each other via
C15−H15···O4 interactions and create a 2D arrangement of
host−guest molecules. Further to this, aromatic rings of guest
quinonilium molecules interact with the oxygen atoms of the
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Figure 9. (a) Host−guest interactions in a part of the crystal structure
of IX. (b) 3D supramolecular architecture containing two different sets
of guest molecules inside the channels (along the a-axis). (c) Space
filling model after removal of guest quinoline (blue and red) molecules
inside the channels.
Figure 8. (a) Intermolecular interactions in a part of crystal structure
of VIII. (b) 3D hexameric assemblies of host molecules creating
channels along the a-axis. (c) Space filling model after removal of guest
molecules inside the channels.
host molecule via discrete donor C37−H37···O1 and C35−
H35···O4 interactions, respectively. The host molecules do not
enclose any weak interaction between them. The guest
quinoline molecules belonging to the first and third set interact
with each other only via C−H···π (dC19...π 3.75 Å) interaction.
The C−H···O interactions between the host molecules and first
set of quinoline molecules aggregate them in a 1D layer.
Further, creation of a 3D channel-like supramolecular structure
occurs in the lattice by the other interactions experienced
between host and quinoline molecules. The second and third
set of quinoline molecules do not participate in the channel
formation. However, the channels (approximate 20 × 11 Å
dimensions) created by the combination of the first set of
quinoline and host molecules accommodate the second and
third set of quinoline molecules as viewed along the a-axis
(Figure 9b,c). A quinoline solvate of dopamine based
pyromellitic diimide host is reported to create channels in the
lattice in which two sets of symmetry nonequivalent guest
molecules are found to be involved in the construction of
channels, whereas the third set of guest molecules takes
position inside the channels.11c
−OH group and carbonyl group of host molecules via O···π
(dO3...π 3.21 Å and dO5...π 3.21 Å) interactions. Consequently,
individual 2D layers pack together to construct a 3D
supramolecular host−guest channel network in the lattice
where repeated hexameric assemblies of host molecules are
involved in the formation of an individual channel of
approximate 14 × 5 Å dimension. The channels formed by
repeated 3D hexameric assemblies of host molecules
accommodate the guest quinoline molecules as viewed along
the a-axis (Figure 8b,c).
The solvate IX crystallized in the triclinic P1 space group and
̅
it contains a half molecule of 6 lying on the inversion center
with three symmetry nonequivalent guest quinoline molecules
in its crystallographic asymmetric unit. In the crystal lattice of
IX, all the three symmetry independent quinoline molecules are
found to associate with the host molecule via different weak
interactions (Figure 9a). First set of quinoline molecules form a
The solvate X crystallized in the triclinic P1 space group and
̅
1
cyclic R2 (6) hydrogen bond motif interacting with the −OH
it contains a half molecule of 8 lying on the inversion center
with three and half symmetry nonequivalent guest quinoline
molecules in the crystallographic asymmetric unit. The guest
quinoline molecule, which appears as its half in the asymmetric
unit, is disordered the same as in the case of structure VII. In
the crystal lattice of X, the host molecules do not interact with
each other in any kind of weak interaction (Figure 10a). Likely,
no interaction between the disorder quinoline and host
molecule is observed in the lattice. The remaining three
symmetry independent quinoline molecules have different
types of interactions with the host molecule. The first set of
quinoline molecules has three different types of interactions
and aromatic ring of the host molecule by the combination of
acceptor O3−H3A···N2 and C3−H3···N2 interactions. This
quinoline molecule also demonstrates some other weak
interactions, namely, donor C16−H16···O5 and acceptor
C3−H3A···π (dC3...π 3.69 Å) interactions with the carbonyl
group and aromatic ring of the host molecule, respectively.
Another set of quinoline molecules participate in the formation
of a discrete O2−H2···N3 hydrogen bond with the −COOH
group of the host molecule. A third set of quinoline molecules
does not facilitate by O−H···N interactions but interacts with
the oxygen atoms of the −COOH and carbonyl groups of the
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respectively, and one acceptor O3−H3A···N2 interaction with
the −OH group. The second set of quinoline molecule forms a
2
cyclic R2 (7) hydrogen bond motif with the −COOH group by
the combination of donor−acceptor O1−H1···N4 and C33−
H33···O2 interaction. The third set of quinoline molecules
interacts with the carbonyl group of the host molecule via the
donor C30−H30···O4 interaction, simultaneously showing
strong π···π contacts with the naphthalene ring of the host
molecule. These host−guest interactions are found to be
responsible for the formation of a 2D layered network of host
and guest molecules in the lattice. These 2D layers are further
grown along the a-axis via guest−guest C−H···π (dC45...π 3.44
Å) interactions experienced between the disordered and second
set of quinoline molecules. Thus, a 3D supramolecular host−
guest architecture is constructed in the lattice which contains
2D rectangular channels of approximate 11 × 11 Å dimension
along the a-axis. The channels are formed by the layered
arrangement of the host and first set of quinoline molecules. A
third set of quinoline molecules are sandwiched inside these
channels via weak interactions. The disordered and second set
of guest molecules do not take part in the formation of
channels but participate in the enhancement of supramolecular
architecture from 2D to 3D through weak interactions in the
crystal lattice (Figure 10b,c). However, the quinoline solvates
of naphthalene diimide tethered carboxylic acids have been
reported to form pseudopolymorphic structures via different
types of host−guest interactions, but the formation of channels
in these structures may be attributed to the role of additional
O−H···N interactions that exist between the −OH group of the
host molecule and guest quinoline molecules.
Figure 10. (a) Host−guest interactions in a part of the crystal
structure of X. (b) 3D host−guest channels architecture containing a
set of guest molecules inside the channels. (c) Space filling model after
the removal of guest quinoline molecules inside the channels.
with the host molecule: two donor C17−H17···O2 and C15−
H15···O5 interactions with the −COOH and carbonyl groups,
Figure 11. Solid state fluorescence emission spectra of host compounds, 1−8.
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The PXRD patterns of all the quinoline solvates are shown in
Figures S5−S10 in the Supporting Information. All of the peaks
of different solvates can be correlated nearly with their
respective simulated PXRD patterns of single crystal X-ray
structures. However, some small deviations are attributed to the
loss of solvent molecules leading to loss of crystallinity. TGA
on quinoline solvates was also carried out (Figures S14−S19).
TGA curve of V reveals the loss of 32.7% weight corresponding
to one equivalent of water and one equivalent of quinoline
molecule in the temperature range 125−220 °C (calcd 34.1%).
In solvate VI, 47.9% weight loss occurs in one step between
100 and 185 °C, which corresponds to two equivalents of
quinoline molecules (calcd 47.7%). Solvate VII loses two and
half equivalents of quinoline molecules in two steps between 95
and 210 °C; in the first step, 29.1% weight loss occurs between
95 and 155 °C, which is accounted for by the loss of one and
half quinoline molecules (calcd 29.5%). Further, a 27.7%
weight loss for one quinoline molecule occurs in the second
step in the temperature range 160−210 °C. Compound VIII
shows one step weight loss of 28.1% weight between 145 and
185 °C corresponding to one equivalent of quinoline molecule
(calcd 27.9%). Weight loss of six guest quinoline molecules
occurs in two steps from IX. In the first step, a 39.0% weight
loss corresponds to four equivalent of quinoline molecules,
which occurs between 115 and 150 °C (calcd 39.3%). In the
second step, a 31.9% weight loss occurs from the residue of the
first step for remaining two guest quinoline molecules between
210 and 245 °C (calcd 32.4%). For the solvate X, a continuous
weight loss due to the seven equivalents of quinoline molecules
takes place in the temperature range 115−275 °C correspond-
ing to a weight loss of 58.7% (calcd 62.6%).
Fluorescence Emission of Compounds. The fluores-
cence emission properties of analogous naphthalimide com-
pounds have been reported.7a,15 These compounds are also no
exception to that and they show emissions in the blue spectral
region in both solution and solid state studies. So, it prompted
us to investigate the fluorescence properties of our compounds
in view of potential applications as fluorescent brighteners.16
The solid state fluorescence emission spectra of host
compounds 1−8 are shown in Figure 11. Upon excitation at
300 nm, three emission peaks at 412 nm, 450 and 473 nm are
observed for phthalimide derivatives 1 and 2. For naphthali-
mide derivatives 3, 4, and 5, the excitation wavelength (λex) was
at 320 nm. These compounds show strong emission bands in
the 428−440 nm region. The emission spectra of naphthalene
diimide derivatives 6, 7, and 8 are recorded at λex 340 nm,
which show strong peaks at 472 nm along with two shoulder
peaks at 458 and 516 nm, respectively. However, it is observed
that relative intensities of the emission peaks of isomeric hosts
are also different from each other, which is probably due to the
differences in the supramolecular structures of the compounds
that contained similar functional groups at different positions of
the aromatic rings.17 The emission spectra of pyridine and
quinoline inclusion compounds I−X are also recorded, but no
significant differences are detected in the emission peaks of
hosts and their respective inclusion compounds except the
intensities of emission peaks; therefore, those are not included
in this study.
units are studied. This study illustrates the role of supra-
molecular interactions between two different functional groups
and pyridine/quinoline along with the combined effects of π-
stacking aromatic imide synthons to provide the directional
properties to these host−guest systems. It is also clear from this
study that stability of the channels, which are filled by guest
molecules, are guided by various types of intermolecular host−
guest interactions. We could distinguish two different classes of
channels; namely, one is those constructed by the self-assembly
of hosts containing the guest molecules within them. Another
category includes the channels formed by the combination of
both host and guest molecules containing additional guest
molecules inside them. Since the guest molecules studied here
are relatively bigger in size than conventional solvent molecules,
we identified the symmetry associated with the guest molecules
and found that there are symmetry nonequivalent guests in
certain cases; for example, a system which embedded six
molecules of quinoline, namely, IX, has two symmetry
nonequivalent guest molecules within the channel. This
happens by different orientations of the host−guest interactions
in the channel to make them symmetry independent. We
observed that apart from hydrogen bond interactions between
the host and guest molecules, some other host−host or host−
guest interactions (such as π−π and C−H···π) led to the
inclusion of different numbers of guest molecules with isomeric
host molecules; for example, in the case of quinoline inclusion
compounds, the structures of V and VI are composed of one
and two guest molecules, respectively, containing isomeric
phthalimide host molecules. The structures of VII and VIII are
composed of five per two and one guest molecule, respectively,
containing isomeric naphthalimide host molecules; similarly,
structures of IX and X are composed of six and seven guest
quinoline molecules, respectively, containing isomeric naph-
thalene diimide host molecules. The structures of IX and X
contain a higher number of guest molecules and serve as
excellent storage systems for quinoline molecules by organic
hosts.
ASSOCIATED CONTENT
* Supporting Information
■
S
CIF files, simulated and experimental PXRD patterns, and TGA
curves are available. This material is available free of charge via
the Internet at http://pubs.acs.org.
AUTHOR INFORMATION
Corresponding Author
*E-mail: juba@iitg.ernet.in. Phone: + 91-361-2582311. Fax: +
91-361-2690762.
■
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
■
The authors thank Department of Science and Technology,
New Delhi (India) for financial support. One of the authors
(D.S.) is thankful to Council of Scientific and Industrial
Research, New Delhi (India) for a senior research fellowship.
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CONCLUSIONS
■
Structural features of host−guest complexes of pyridine and
quinoline with a series of hydroxy benzoic acids that are
tethered by phthalimide, naphthalimide, or naphthalene diimide
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