Synthesis, crystal structures and properties of a series of three-dimensional lanthanide coordination polymers with the rigid and flexible mixed dicarboxylate ligands of 1,4-benzene dicarboxylic acid and succinic acid

Article abstract of DOI:10.1016/j.molstruc.2008.12.057

A series of new lanthanide coordination polymers, with the formula [Ln(Suc)_0.5(p-BDC)] (Ln = Eu (1), Sm (2), Tb (3), Pr (4), Ho (5); H₂Suc = succinic acid; p-H₂BDC = 1,4-benzene dicarboxylic acid), have been synthesized un

Full text of DOI:10.1016/j.molstruc.2008.12.057

Journal of Molecular Structure 921 (2009) 126–131
Contents lists available at ScienceDirect
Journal of Molecular Structure
journal homepage: www.elsevier.com/locate/molstruc
Synthesis, crystal structures and properties of a series of three-dimensional
lanthanide coordination polymers with the rigid and flexible mixed
dicarboxylate ligands of 1,4-benzene dicarboxylic acid and succinic acid
a
a,*
a
a
b
Chun-Guang Wang , Yong-Heng Xing , Zhang-Peng Li , Jing Li , Xiao-Qing Zeng ,
b
a
Mao-Fa Ge , Shu-Yun Niu
College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, PR China
a
b
a r t i c l e i n f o
a b s t r a c t
Article history:
Received 17 October 2008
Received in revised form 11 December 2008
Accepted 15 December 2008
Available online 29 December 2008
A series of new lanthanide coordination polymers, with the formula [Ln(Suc)0.5(p-BDC)] (Ln = Eu (1), Sm
(
2 2
2), Tb (3), Pr (4), Ho (5); H Suc = succinic acid; p-H BDC = 1,4-benzene dicarboxylic acid), have been syn-
thesized under hydrothermal condition and all of them have been structurally characterized. X-ray dif-
fraction analyses reveal that complexes 1–5 are isostructural and crystallized in orthorhombic space
group Pbca. One-dimensional infinite inorganic edge-sharing polyhedra chains formed by lanthanide ions
and tetradentate carboxyl groups of succinic acid ligands, link to each other through the carbon atoms of
succinic acid ligands and phenyl groups of the 1,4-benzene dicarboxylic acid ligands, to lead to a three-
dimensional framework structure. In addition, the phase purities of the bulk samples were identified by
X-ray powder diffraction. The photoluminescent properties of 1 and 3 were discussed in detail.
Ó 2008 Elsevier B.V. All rights reserved.
Keywords:
Lanthanide coordination polymer
1
,4-Benzene dicarboxylic acid
Succinic acid
Synthesis
Crystal Structure
Photoluminescent property
1
. Introduction
Crystal engineering based on metal-organic frameworks (MOFs)
For enriching this research field, we chose 1,4-benzene dicar-
boxylic acid and succinic acid as the rigid and flexible mixed multi-
carboxylate ligands to synthesize a new series of lanthanide
coordination polymers. The rigid 1,4-benzene dicarboxylic acid li-
gand seems to be promising to control and adjust open and stable
framework in which there are two carboxyl groups with a 180° an-
gle as well as conjugated aromatic rings [33–36]. On the other hand,
the flexible succinic acid with the flexibility and conformational
freedom may bend and rotate when it coordinates to the metal cen-
ter, and cause the structural diversity with unique structures and
useful properties [37,38,24]. This assembly leads to a intricate
three-dimensional framework structure. Herein, we report the
preparation and crystal structures of Ln–Suc–p-BDC coordination
polymers, [Ln(Suc)0.5(p-BDC)] (Ln = Eu (1), Sm (2), Tb (3), Pr (4),
has attracted intensive interest because of their elegant framework
topologies as well as their potential applications in gas storage,
catalysis, optical and magnetic applications [1–10]. To our knowl-
edge, there are many factors important for the rational design of
MOFs, such as the shape and binding mode of multicarboxylate,
geometry of metal ions, the spacer linking the binding sites, and
so on [11,12]. So, systematic research is a challenge for understand-
ing the role of these factors in the formation of MOFs. In this aspect,
multicarboxylate ligands which are usually employed in the archi-
tectures for lanthanide-containing MOFs, have received consider-
able study due to their availability and potential for the tailored
design of the frameworks [13–18]. So far, much work is focused
on using single rigid multicarboxylate ligands (1,4-benzenedicarb-
oxylic acid, 1,3,5-benzenetriacetic acid and 1,2,4,5-benzenetetra-
carboxylic acid, etc.) or flexible multicarboxylate ligands (succinic
acid, glutaric acid, adipic acid, etc.) to prepare lanthanide-contain-
ing MOFs [19–28]. However, lanthanide-containing MOFs with
the rigid and flexible mixed multicarboxylate ligands are less devel-
oped [29–32].
Ho (5); Suc = succinic acid; p-H
2
BDC = 1,4-benzene dicarboxylic
acid). The luminescent properties have also been investigated.
2
. Experimental
2.1. Materials and physical measurements
All chemicals purchased were of reagent grade or better and
were used without further purification. Lanthanide chloride salts
were prepared via dissolving lanthanide oxides with 12 M HCl
*
Corresponding author. Tel.: +86 0411 82156987.
E-mail address: yhxing2000@yahoo.com (Y.-H. Xing).
0
022-2860/$ - see front matter Ó 2008 Elsevier B.V. All rights reserved.
doi:10.1016/j.molstruc.2008.12.057

C.-G. Wang et al. / Journal of Molecular Structure 921 (2009) 126–131
127
while adding a bit of H
2
O for Tb
4
O
7
and then evaporating at 100 °C
31.03; H, 1.56; Ho, 42.61. Found: C, 31.05; H: 1.53; Ho, 42.65. IR
data (KBr pellet, cm ) for 2: 3057, 2923, 2854, 1617, 1576,
À1
until the crystal film formed. C and H analyses were made on a Per-
kin-Elmer 240 C automatic analyzer at the analysis center of Liaon-
ing Normal University. Infrared (IR) spectra were recorded on
JASCO FT/IR-480 PLUS Fourier Transform spectrophotometer with
1540, 1502, 1465, 1402, 1315, 1290, 1252, 1165, 1105, 1013,
966, 887, 823, 791, 748, 683, 572, 539, 515; for 3: 3057, 2923,
2854, 1620, 1578, 1542, 1502, 1467, 1402, 1314, 1289, 1251,
1164, 1105, 1013, 968, 887, 824, 791, 749, 685, 576, 541, 515;
for 4: 3057, 2925, 2854, 1614, 1574, 1536, 1402, 1303, 1214,
1166, 1050, 999, 905, 886, 821, 790, 747, 681, 647, 570, 513; for
5: 3057, 2926, 2853, 1621, 1579, 1542, 1405, 1314, 1290, 1252,
1163, 1107, 1013, 970, 905, 886, 825, 791, 748, 687, 579, 543, 516.
À1
pressed KBr pellets in the range 200–4000 cm . The luminescence
spectra were reported on a JASCO FP-6500 spectrofluorimeter (so-
lid) in the range of 200–850 nm. Content of Lanthanide was ana-
lyzed on a Plasma-Spec(I)-AES model ICP spectrometer. The
powder X-ray diffraction (PXRD) data were collected on a Bruker
Advance-D8 with Cu Ka radiation, in the range 5°<2h<60°, with a
step size of 0.02°(2h) and an acquisition time of 2s per step.
2.4. X-ray crystallography
2
.2. Synthesis of [Eu(Suc)0.5(p-BDC)] (1)
Suitable single crystals of five complexes were mounted on
glass fibers for X-ray measurement. Reflection data were col-
lected at room temperature on a Bruker AXS SMART APEX II
CCD diffractometer for complex 2 and Rigaku R-AXIS RAPID IP
diffractometer for complexes 1, and 3–5 with graphite mono-
The complex was prepared by hydrothermal reaction. EuCl
3
6
1
H
H
2
O (0.20 g, 0.55 mmol), succinc acid (H
,4-benzene dicarboxylic acid (p-H BDC, 0.10 g, 0.60 mmol), and
O (10 ml) were mixed in 25 ml beaker. The pH value was ad-
2
Suc, 0.10 g, 0.85 mmol),
2
2
chromatized Mo Ka radiation (k = 0.71073 Å). Crystal structures
justed to 6.5 with ethylenediamine. After stirring for 2 h, the mix-
ture was sealed in the bomb and heated at 180 °C for four days,
then cooled at 10 °C/3 h to 100 °C, followed by slow cooling to
room temperature. After filtration, the product was washed with
distilled water and then dried at room temperature. Yield: 73%
were solved by the direct method. All non-hydrogen atoms were
refined anisotropically. Hydrogen atoms were located on the ba-
sis of the difference Foutier map for all the complexes. All
calculations were performed using the program SHELX-97 pro-
gram [39]. The crystallographic data and experimental details of
the data collection and the structure refinement are given in
Table 1. Selected bond lengths and angles of complexes 1–5 are
listed in Table 2.
(
based on Eh(III)). Elemental analysis for 1:
10 6 6
C H O Eu
(
Mr = 374.11). Calcd: C, 32.11; H, 1.61; Eu, 40.62. Found: C,
À1
3
2
1
2.13; H: 1.63; Eu, 40.60. IR data (KBr pellet,
m[cm ]): 3057,
924, 2854, 1617, 1577, 1541, 1502, 1466, 1402, 1316, 1289,
165, 1105, 1013, 967, 887, 823, 791, 748, 683, 573, 539, 514.
3
. Results and discussion
2.3. Synthesis of [Ln(Suc)0.5(p-BDC)] (Ln = Sm (2), Tb (3), Pr (4), Ho(5))
The title compound was synthesized in the hydrothermal reac-
3 2
tion of LnCl 6H O with 1,4-benzenedicarboxylic acid, succinc acid.
Complexes 2–5 were synthesized by a method similar to that of
except EuCl 6H O was replaced by LnCl 6H O (Ln = Sm, Tb, Pr,
3 2 3 2
Ho, 0.55 mmol), and the reaction was heated at 160 °C for 7 days
for 3–5. Yield: 68% (based on Sm), 78% (based on Tb), 64% (4),
X-ray powder diffraction analysis of complex 1–5 shows that the
X-ray powder diffraction data are in agreement with that of calcu-
lated on the basis of the structural data (Fig. 1), that is, 1–5 have
been obtained successfully as pure crystalline phases.
1
and 61% (5). Elemental analysis for 2: C10
Calcd: C, 32.24; H,1.62; Sm, 40.37. Found: C, 32.27; H: 1.64; Sm,
0.35; for 3: C10 Tb (Mr = 381.07). Calcd: C, 31.52; H, 1.59;
Tb, 41.71. Found: C, 31.53; H: 1.56; Tb, 41.74; for 4: C10 Pr
Mr = 363.05): Calcd: C, 33.08; H, 1.67; Pr, 38.81. Found: C, 33.05;
6 6
H O Sm (Mr = 372.50).
3.1. Description of crystal structures
4
6 6
H O
6 6
H O
Single-crystal X-ray structural analyses revealed that the frame-
works of 1–5 are isostructural. Therefore, complex 1 is taken as an
example to present and discuss the structure in detail.
(
H: 1.69; Pr, 38.84; for 5: C10
6
H O
6
Ho (Mr = 387.08): Calcd: C,
Table 1
Crystallographic data for 1–5.
1
2
3
4
5
Formula
M (g mol
Temperature (K)
Crystal system
Space group
a (Å)
C
10
H
6
O
6
Eu
C
10
H
6
O
6
Sm
C
10
H
6
O
6
Tb
C
10
H
6
O
6
Pr
C
10 6 6
H O Ho
À1
)
374.11
298(2)
Orthorhombic
Pbca
13.956(3)
6.8726(14)
21.829(4)
2093.7(7)
8
372.50
298(2)
Orthorhombic
Pbca
14.0029(17)
6.8928(8)
21.883(3)
2112.1(4)
8
381.07
298(2)
Orthorhombic
Pbca
13.895(3)
6.8249(14)
21.746(4)
2062.2(7)
8
363.06
298(2)
Orthorhombic
Pbca
14.102(3)
6.9727(14)
21.982(4)
2161.5(7)
8
387.08
298(2)
Orthorhombic
Pbca
13.807(3)
6.7801(14)
21.691(4)
2030.6(7)
8
b (Å)
c (Å)
3
V (Å )
Z
D
(g/cm3)
2.374
6.004
2.343
5.573
2.455
6.872
2.231
4.520
2.532
7.806
c
À1
l(Mo K
a
)/cm
F(000)
1416
1408
1432
1384
1448
GOF
R
1.170
0.0207
1.010
1.098
1.156
1.061
a
0.0306
0.0209
0.0294
0.0210
b
(0.0471)b
0.0587
(0.0237)b
0.0477
(0.0315)b
0.0793
(0.0244)b
0.0499
(
0.0227)
wR a
) (e/Å
0.0511
2
b
(0.0654)b
1.471, À0.832
(0.0490)b
0.796, À0.698
(0.0817)b
1.331, À1.348
(0.0513)b
0.910, À0.579
(
0.0518)
À3
D
(q
)
0.997, À1.110
a
2
2 2
c o o o
) /[R(w(F > 4r (F )].
2)2]1/2; [F
R =
R
||F
o
| À |F
c
||/
R
|F
o
|, wR
2
= [R
(w(F
o
À F
b
Based on all data.

1
28
C.-G. Wang et al. / Journal of Molecular Structure 921 (2009) 126–131
Table 2
Selected bond lengths (Å) and angles (°) for 1–5.
Complex 1
EuAO5
EuAO4
EuAO3
O5AEuAO1
O5AEuAO4
O5AEuAO3
O2BAEuAO3
Complex 2
SmAO5
2.284(2)
2.366(2)
2.528(2)
86.08(8)
75.35(9)
166.10(8)
64.51(7)
EuAO1
EuAO3A
EuAO2
O5AEuAO6
O1AEuAO4
O1AEuAO3
O5AEuAO2
2.333(2)
2.441(2)
2.576(2)
104.93(8)
134.69(9)
96.95(8)
143.11(8)
EuAO6
EuAO2B
2.349(2)
2.497(2)
O1AEuAO6
O6AEuAO2B
O3AAEuAO3
O3AEuAO2
151.12(9)
126.07(8)
113.87(6)
50.63(7)
2.300(3)
2.376(3)
2.538(3)
86.08(8)
75.35(9)
166.10(8)
64.51(7)
SmAO1
SmAO3A
SmAO2
O5ASmAO6
O1ASmAO4
O1ASmAO3
O5ASmAO2
2.345(3)
2.457(3)
2.590(3)
104.93(8)
134.69(9)
96.95(8)
143.11(8)
SmAO6
SmAO2B
2.361(3)
2.498(3)
SmAO4
SmAO3
O5ASmAO1
O5ASmAO4
O5ASmAO3
O2BASmAO3
Complex 3
TbAO5
O1ASmAO6
O6ASmAO2B
O3AASmAO3
O3ASmAO2
151.12(9)
126.07(8)
113.87(6)
50.63(7)
2.259(2)
2.341(2)
2.501(2)
85.69(8)
75.62(9)
165.91(8)
64.28(8)
TbAO1
TbAO3A
TbAO2
O5ATbAO4
O1ATbAO6
O1ATbAO3
O5ATbAO2
2.306(2)
2.420(2)
2.551(2)
104.65(9)
134.40(9)
97.49(9)
142.84(8)
TbAO4
TbAO2B
2.320(2)
2.482(2)
TbAO6
TbAO3
O5ATbAO1
O5ATbAO6
O5ATbAO3
O2BATbAO3
Complex 4
PrAO5
O1ATbAO4
O4ATbAO2B
O3AATbAO3
O3ATbAO2
151.73(9)
126.01(8)
113.99(6)
51.08(8)
2.345(2)
2.411(2)
2.579(2)
86.87(9)
75.34(9)
155.66(8)
113.01(7)
PrAO1
PrAO3A
PrAO2
O5APrAO4
O1APrAO6
O5APrAO3
O2BAPrAO3
2.396(2)
2.499(3)
2.643(2)
105.55(8)
135.28(10)
167.19(9)
65.15(8)
PrAO4
PrAO2B
2.406(2)
2.535(2)
PrAO6
PrAO3
O5APrAO1
O5APrAO6
O3AAPrAO2B
O3AAPrAO3
Complex 5
HoAO5
HoAO6
HoAO3
O5AHoAO1
O5AHoAO6
O5AHoAO3
O2BAHoAO3
O1APrAO4
O4APrAO2B
O1APrAO3
O3APrAO2
149.40(10)
126.36(8)
95.84(10)
49.35(8)
2.232(2)
2.319(2)
2.472(2)
85.43(8)
75.88(9)
165.84(8)
63.98(8)
HoAO1
HoAO3A
HoAO2
O5AHoAO4
O1AHoAO6
O1AHoAO3
O5AHoAO2
2.285(2)
2.401(3)
2.521(2)
104.41(9)
134.25(9)
97.59(9)
142.43(8)
HoAO4
HoAO2B
2.299(2)
2.465(2)
O1AHoAO4
O4AHoAO2B
O3AAHoAO3
O3AHoAO2
152.11(8)
125.95(8)
114.08(6)
51.53(8)
Symmetry codes: A: Àx + 1/2, y À 1/2, z; B: Àx + 1/2, y + 1/2, z for 1, 4; A: Àx + 1/2, y + 1/2, z; B: Àx + 1/2, y À 1/2, z for 3; A: Àx + 3/2, y + 1/2, z; B: Àx + 3/2, y À 1/2, z for 2, 5.
Fig. 1. The powder XRD patterns: (a) the simulated PXRD pattern calculated from
single-crystal structure of complex 1; (b) experimental PXRD for complex 1; (c)
experimental PXRD for complex 2; (d) experimental PXRD for complex 3; (e)
experimental PXRD for complex 4; (f) experimental PXRD for complex 5.
Fig. 2. Coordination environment of Eu in complex 1 with non-hydrogen atoms
drawn by diamond. Carbon atoms of Suc ligands are yellow for being different from
those of p-BDC ligands (purple). Symmetry codes: A: Àx + 1/2, y À 1/2, z; B: Àx + 1/
Complex 1 shows a three-dimensional framework, in which the
asymmetric unit contains one eight-coordinated europium ion,
half a Suc ligand and a p-BDC ligand. The coordination mode of
the europium ions (Eu) are shown in Fig. 2. The eight oxygen atoms
2, y + 1/2, z.
coordinated with Eu are from two dimonodentate carboxyl groups
(O1 and O2B) and one chelating bidentate carboxyl group (O2 and

C.-G. Wang et al. / Journal of Molecular Structure 921 (2009) 126–131
129
respectively, all of which are comparable to those reported for
other europium–oxygen donor complexes [31,40]. For Suc ligand,
its coordination mode in complex 1 is rare, compared to those re-
ported Ln–Suc complexes [37,38,24]. Both carboxylate groups of
each Suc ligand exhibit only one kind of coordination mode:
g –g -bridging (namely one oxygen atom of the carboxylate group
3
l –
2
2
connects two metal ions, the other one connects also two metal
ions and the carboxylate group coordinates to three metal ions)
(Scheme 1, I). And the Suc ligand assumes a anti conformation with
the torsion angle of C8–C9–C9E–C8E being 180.0°, which is similar
Scheme 1. Coordination modes of the Suc (I) and p-BDC (II) Ligands in 1–5.
O3) from Suc ligand, and four dimonodentate carboxyl groups (O1,
O5, O7, and O9) from p-BDC ligand. The distances of EuAOSuc (from
succinic acid) and EuAOp-BDC (from 1,4-benzene dicarboxylic acid)
are in the ranges of 2.441(2)–2.576(2), and 2.284(2)–2.366(2) Å,
Fig. 5. The layers link to each other by p-BDC ligands to form 3D framework.
Fig. 3. A polyhedra chain (sharing edges) formed by Eu and its corresponding
centrosymmtric atoms through the tetradentate carboxylate bridging interactions
of Suc ligands. Hydrogen atoms are omitted for clarity.
Fig. 4. Two-dimensional layer structure formed polyhedra chains linked to each
other by the Suc ligands on [110] plane. Hydrogen atoms and parts of p-BDC
ligands are omitted for clarity.
Fig. 6. Room-temperature solid-state photoluminescence spectra of complexes 1
(bottom) and 3 (top).

1
30
C.-G. Wang et al. / Journal of Molecular Structure 921 (2009) 126–131
Table 3
The detailed attribution of IR for 1–5.
1
2
3
4
5
À
m
m
m
m
d
s(COO)
1402
1541
1617
3057
1402
1540
1617
3057
1402
1542
1620
3057
1402
1536
1614
3057
1405
1542
1621
3057
À
as(COO)
C@C of vibration of benzene ring
@CAH of benzene
@CAH out of the face of benzene
823
823
824
822
825
1
,4-Substitutions of the benzene ring
683, 748
2854, 2924
683, 748
2854, 2923
685, 749
2854, 2923
681, 747
2854, 2925
687, 748
2853, 2926
mCAH vibrational modes of –CH – groups
2
to that of reported complexes, such as the torsion angle in complex
Eu (Suc) (H O) is 179.2 ° [24]. For p-BDC ligand, each of two
carboxylate groups of it adopts a
ligands are deproponated. The detailed attribution of IR for com-
plexes 1–5 is listed in Table 3.
[
2
3
2
2
]
n
1
1
2
l –g –g -bridging (namely one
oxygen atom of the carboxylate group connects one metal ion,
the other one connects also one metal ion and the carboxylate
group coordinates to two metal ions) (Scheme 1, II).
To deeply understand the structures of frameworks and coordi-
nated carboxylate molecular conformation, it would be important
to explore the connection ways of the metal centers and carboxyl-
ate ligands. In complex 1, Lanthanide metal center atoms (Eu) and
its corresponding centrosymmetric atoms are linked through
bridging tetradentate carboxyl groups of Suc ligands to form a
4
. Conclusions
Five
new
three-dimensional
isostructural
complexes
[
Ln(Suc)0.5(p-BDC)] (Ln = Eu(1), Sm(2), Tb(3), Pr(4), Ho(5)) have
been synthesized under hydrothermal condition. X-ray diffraction
analyses reveal that they are crystallized in the orthorhombic
space group Pbca. The 3D framework structures of complexes 1–
5
are formed by p-BDC ligands connecting the 2D layers of lantha-
nide ions and Suc ligands. At room temperature, complexes 1 and 3
emit red and green luminescence, respectively, and no solvent
molecule is directly connected to the framework of them, so it
would be a useful feature to produce functional luminescent mate-
rials considering the quenching effect of –OH oscillators on
luminescence.
8
one-dimensional (1D) infinite edge-sharing EuO polyhedra chain
along the [010] direction (Fig. 3). These polyhedra chains connect
each other by the carbon atoms of Suc ligands on the [110] plane
to form a 2D layer structure (Fig. 4). As a good rigid linker, two car-
boxyl groups and a phenyl group of p-BDC ligand play an impor-
tant fixing role in the structure of 1. For both carboxyl groups of
each p-BDC ligand, one links two adjacent Eu atoms of one polyhe-
dra chain to fix the structure of the chain itself, the other links two
adjacent Eu atoms of two adjacent chains to fix the connection of
chains. Along the [100] direction, the coordination ways of p-
BDC ligands appear inverted alternately in pairs. Furthermore,
the layers are linked by phenyl groups of p-BDC ligands into a 3D
framework structure (Fig. 5).
5. Supplementary material
Crystallographic data for the four complexes in this paper have
been deposited at the Cambridge Crystallographic data center,
CCDC Nos. 687565, 687564, 694475, 687567, 694476 are for com-
plexes 1–5, respectively. These data can be obtained free of charge
at http://www.ccdc.cam.ac.uk/conts/retrieving-.html (or from the
Cambridge Crystallographic Data Center, 12 Union Road, Cam-
bridge CB2 1EZ, UK; fax: +44 1223-336-033; e-mail:
deposit@ccdc.cam.ac.uk).
3.2. Photoluminescent properties
The solid-state luminescent properties of complexes 1 and 3
were investigated at room temperature. When excited at
95 nm for 1 and 312 nm for 3, they emit red light (1) and green
3
Acknowledgments
luminescence (3) at room temperature (Fig. 6). The emission
peaks of the complexes correspond to the transitions from
This work was financially supported by the National Natural
Science Foundation of China (Grant No. 20771051, 20633050),
Education Foundation of Liaoning Province in China (Grant No.
2007T093) for financial assistance.
5
7
D
0
? F
n
(n = 1, 2, 3 and 4) transitions at 590, 618, 652, and
5
7
7
00 nm for the Eu(III) ion in 1 and
4 n
D ? F (n = 6, 5, 4, and3)
transitions at 490, 544, 583, and 621 nm for the Tb(III) ion in 3.
Among these emission lines, the most striking red emissions
5
7
5
7
(
D
0
? F
for complex 3 were observed in their emission spectra. The lumi-
nescent characters of them are similar to those of [Ln (Suc)0.5(B-
C) (OH) ] (Ln = Tb, Eu) [31].
2 4 5
) for complex 1 and green luminescence ( D ? F )
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