Three multinuclear metal-organic coordination compounds based on 8-hydroxyquinoline derivative: Syntheses, structures and fluorescence properties

Article abstract of DOI:10.1016/j.poly.2015.10.002

By taking advantage of the synthetic 8-hydroxyquinoline derivative, (E)-2-[2-(4-chlorophenyl)vinyl]-8-hydroxyquinoline (HL), three new metal-organic coordination compounds [Zn₃L₆] (1), [Cd₃L₆] (2) and [Cu_2<

Full text of DOI:10.1016/j.poly.2015.10.002

Accepted Manuscript
Three multinuclear metal-organic coordination compounds based on 8-hydrox-
yquinoline derivative: syntheses, structures and fluorescence properties
Jiangjiao Shi, Chunhua Gong, Xianghua Zeng, Junyong Zhang, Chengfeng Zhu,
Jingli Xie
PII:
S0277-5387(15)00578-1
DOI:
http://dx.doi.org/10.1016/j.poly.2015.10.002
POLY 11582
Reference:
Polyhedron
To appear in:
Received Date:
Accepted Date:
4 September 2015
1 October 2015
Please cite this article as: J. Shi, C. Gong, X. Zeng, J. Zhang, C. Zhu, J. Xie, Three multinuclear metal-organic
coordination compounds based on 8-hydroxyquinoline derivative: syntheses, structures and fluorescence properties,
Polyhedron (2015), doi: http://dx.doi.org/10.1016/j.poly.2015.10.002
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Three multinuclear metal-organic coordination compounds
based on 8-hydroxyquinoline derivative: syntheses, structures
and fluorescence properties
a,
∗
Jiangjiao Shia, Chunhua Gonga, Xianghua Zenga, Junyong Zhang , Chengfeng Zhua,
a,b
∗
Jingli Xie
a College of Biological, Chemical Science and Engineering, Jiaxing University,
Jiaxing 314001, PR China E-mail: zhangjy@mail.zjxu.edu.cn;
jlxie@mail.zjxu.edu.cn
b State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093,
PR China
Abstract: By taking advantage of the synthetic 8-hydroxyquinoline derivatives,
(E)-2-[2- (4-chlorophenyl)vinyl]-8-hydroxyquinoline (HL), three new metal-organic
coordination compounds [Zn3L6] (1), [Cd3L6] (2) and [Cu2L4] (3) have been obtained
by solvothermal or solution processing methods and structurally characterized. Single
crystal X-ray diffraction analysis revealed that complexes 1 and 2 have similar
‘V’-type trinuclear structures. Different from complexes 1 and 2 (trinuclear structure),
complex 3 displays dinuclear structure. The effects of central metals and reaction
solvents on the structures of complexes 1–3 have been discussed. Furthermore,
thermogravimetric analysis and solid state fluorescence of ligand HL, 1–3 were
investigated.
Keywords: 8-hydroxy quinoline derivatives; metal-organic coordination compounds;
crystal structure; solid state fluorescence

1. Introduction
The construction of novel metal-organic coordination polymers (MOCPs) has
received extensive research efforts not only for their intriguing architectures and
topologies but also for their promising application in chemical separation [1], catalysis
[2], selective adsorption [3], luminescence [4], magnetism [5], etc. The selection of
optimal organic ligands plays an important role in the construction of desirable
MOCPs. Since the researchers first reported aluminum tris-8-hydroxyquinoline (AlQ3)
could be used as an emissive material in organic light-emitting diodes (OLEDs) [6],
the research of quinolinates-based MOCPs have resulted in a large number of
functional materials. In particular, a lot of 8-Hydroxyquinoline derivatives could be
fabricated through organic reactions [7], hence 8-hydroxyquinoline and its derivatives
are usually selected as functional organic ligands to react with a wide range of metal
ions, including main group, transition and rare earth metal ions, and leads to the
formation of materials with light-emitting properties [8]. Previous reports have
demonstrated that luminescent properties of 8-hydroxyquinolinate-based complexes
are not only related to the composition of the materials, but also are heavily dependent
on the molecular and supramolecular structure which fabricated via the intermolecular
noncovalent interactions [9]. It is thus crucial to tune the structure and intermolecular
packing at the molecular level to accomplish luminescence materials [ 10 ].
Specifically, to overcome the limitations of the MQn-type mononuclear complexes,
Lewiński [11] and Yuan [12] recently have synthesized a series of multinuclear Zn(II)
and Cd(II) coordination compounds involving 8-hydroxyquinoline derivative ligands
aiming to obtain improved and controllable photoluminescence features. So it is
anticipated that more quinolinates-based coordinaton compounds could be constructed
consistently and insights into the relationship between the structural characteristics
and properties could be elucidated and consequently, help to develop useful functional
materials.
On the basis of the aforementioned points, in this contribution, we synthesized a
8-hydroxyquinoline
derivative
as
ligand
(Scheme
1),
namely
(E)-2-[2- (4-chlorophenyl)vinyl]-8-hydroxyquinoline (HL), to react with different

transition metal ions with the aim to understand the effect of the central metals on the
construction and architectures of the target coordination compounds. As a result, three
new coordination compounds: [Zn3L6] (1), [Cd3L6] (2) and [Cu2L4] (3) have been
achieved under solvothermal or solution processing conditions. The effect of the
central metals on the assembly and structures of the title complexes has been
discussed. Additionally, thermogravimetric analysis and solid state fluorescence of
1–3 were investigated.
CHO
H2O
pyridine
Cl
Acetic anhydride
N
N
OCOCH3
OH
Cl
Zn(ClO4)2
[Zn3L6] (1)
[Cd3L6] (2)
[Cu2L4] (3)
DMF/C2H5OH/CH3CN
N
Cd(OAc)2
DMF/C2H5OH/CH3CN
OH
Cl
CuSO4
DMF/THF
Scheme 1 The synthetic routes of HL and complexes 1–3.
2. Experimental
2.1. Reagents and general techniques
All chemicals were reagent grade and used as supplied from Aladdin-Reagent
without further purification. Elemental analyses of C, H and N were performed with a
vario MICRO elemental analyzer. The IR (KBr pellet) spectrum was recorded
(400–4000 cm−1 region) on a VARIAN CARY5000 IR spectrometer. 1H and 13C NMR
experiments were carried out on an ADVENCE400M spectrometer operating at
resonance frequencies of 400 MHz. Thermal gravimetric analysis (TGA) was
performed using a STA-409PC Synchronous thermal analyzer with a heating rate of
0.5 ℃ min-1. Luminescence spectra were measured on a Hitachi F4000 apparatus at

room temperature.
Electrochemistry property was investigated in a three-electrode arrangement with
a glassy carbon (Ф = 1 mm) working electrode, a Pt wire as the counter electrode, and
Ag / AgCl as the reference electrode. Ferrocene was added as an internal standard and
all potentials are quoted against ferrocenium / ferrocene couple (Fc+ / Fc).
.
Safety consideration: the Zn(ClO4)2 6H2O is potential explosive and it is
recommended that care be taken when handling this substance and only minimum
amount be used.
2.2. Synthesis of ligand (HL)
Step one: The p-chlorobenzaldehyde (0.01 mol, 1.41 g) was added to a
suspension of 2-methyl-8-hydroxyquinoline (0.01 mol, 1.59 g) in acetic anhydride (10
mL) at the room temperature. Then the mixture was magnetically stirred and heated at
reflux for 20 hours. When the mixture cooled to room temperature, the reaction
solution was poured into 800 mL ice water, and the yellow-brown solid has been
obtained. Then the solid was extracted with dichloromethane. The organic phase was
washed by distilled water and saline solution, and dried by anhydrous sodium sulfate
over 0.5 hour. The solvent of the organic phase was removed by reduced pressure to
give the crude product, and the crude product was purified by silica gel column
chromatography to give (E)-2-[2-(4-chlorophenyl) ethenyl]-8-acetoxyquinoline (2.17
g, 70%).
Step two: (E)-2-[2-(4-chlorophenyl)ethenyl]-8-acetoxyquinoline (6.7 mmol, 2.17
g) was dissolved in pyridine (30 mL) and stirred for 20 minutes, then distilled water
(10 mL) was added under magnetic stirring, the mixture was reflux for 12 hours. Next
let it cool to room temperature, the pyridine was removed under reduced pressure.
After added 200 mL distilled water, the mixture was stirred for 0.5 hour at room
temperature, and yellow solid was got after filtration. Finally, the yellow solid was
purified by column chromatography to give the desired product
(E)-2-[2-(4-chlorophenyl)ethenyl]-8-hydroxyquinoline (HL) (1.89 g, 90%). 1H-
NMR(CDCl3) δ: 7.14-7.16(d, J = 8.4 Hz, 1H), 7.29-7.41(m, 4H), 7.53-7.67(m, 4H),
13
8.09-8.11(d, J = 8.8 Hz, 1H); C-NMR(CDCl3) δ: 110.0, 117.7, 120.4, 127.4, 128.4,

129.0, 132.8, 134.4, 134.8, 136.5, 137.9, 151.9, 135.1. Elemental analysis (%): calcd
for (C17H12ONCl) C: 72.46, H: 4.26, N: 4.97. Found C: 72.33, H: 4.41, N: 4.86.
2.3. Synthesis of complex 1 (Zn3L6):
.
A solvothermal reaction of Zn(ClO4)2 6H2O (7.4 mg), and HL (1.2 mg) in a
mixture solvent system of DMF-ethanol-acetonitrile (0.2 mL/0.5 mL/3 mL) was
performed at 100℃ for 24h. The orange-red crystals of 1 were obtained in 20% yield
(based on ligand). Elemental analysis (%): Calcd for C102H66Cl6N6O6Zn3: C: 65.15, H:
3.54, N: 4.47. Found: C: 62.95, H: 3.73, N: 4.92. IR (KBr pellet): 410.8(m), 449.8(w),
488.9(m), 528.0(m), 710.2(m), 749.2(m), 827.8(s), 974.8(w), 1004.3(w), 1088.2(m),
1151.8(m), 1194.7(s), 1235.2(m), 1322.9(m), 1401.5(m), 1436.2(m), 1460.8(s),
1514.8(s), 1563.5(s), 1587.6(m), 3039.8(w), 3373.4(s).
.
.
Note: Our attempts to use other Zn salts such as Zn(OAc)2 2H2O, ZnSO4 7H2O,
.
.
Zn(NO3)2 6H2O etc were unsuccessful (to avoid using Zn(ClO4)2 6H2O due to the
safety concern), this may indicate that careful selecting the starting material is crucial
for the experiment.
2.4. Synthesis of complex 2(Cd3L6)
Complex 2 was synthesized following the procedure similar to that of complex 1,
.
.
except that Cd(OAc)2 2H2O (2.3 mg) was added instead of Zn(ClO4)2 7H2O. The red
crystals of 2 were obtained in 20% yield (based on ligand). Elemental analysis (%):
Calcd for C102H66Cd3Cl6N6O6, C: 60.60, H: 3.29, N: 4.16. Found: C: 59.81, H: 3.63,
N: 4.25. IR (KBr pellet): 404.5(m), 484.5(m), 717.9(m), 746.9(s), 839.4(m), 973.9(m),
1009.1(m), 1089.1(s), 1153.2(s), 1199.5(m), 1234.7(w), 1316.2(w), 1432.9(s),
1508.1(s), 1560.6(m), 1595.8(s), 3043.2(w), 3357.0(m), 3374.4(m).
2.5. Synthesis of complex 3(Cu2L4)
.
A mixture of CuSO4 5H2O (2.5 mg), and HL (1.2 mg) in a solvent system of
DMF-THF (3 mL/2 mL ) was performed at room temperature. Then the solvent was
evaporated at room temperature to give the black crystals 3 in 35% yield (based on
the ligand) after three days. Elemental analysis (%): Calcd for C68H44Cl4Cu2N4O4, C:
65.34, H: 3.55, N: 4.48. Found: C: 65.17, H: 3.70, N: 4.38. IR (KBr pellet): 409.3(m),

537.1(w), 740.5(m), 828.3(s), 967.6(m), 1009.1(m), 1106.5(s), 1270.0(m), 1333.5(m),
1375.5(w), 1455.0(s), 1497.0(s), 1549.5(m), 1598.6(s), 1629.6, 2362.0(w), 3048.0(m),
3449.6(m).
2.6. X-ray crystallography
Suitable crystals of 1-3 were collected on a Xcalibur, Eos, Gemini diffractometer.
The crystal was kept at 293 K during data collection. Using Olex2 [13], the structure
was solved with the Superflip [14] structure solution program using Charge Flipping
and refined with the olex2.refine refinement package using Gauss-Newton
minimisation. Crystallographic data and structure refinements for 1–3 are summarized
in Table 1 and structural diagrams are shown in supporting information.

Table 1 Crystal data and structure refinements for 1–3.
Compound
Empirical formula
Formula weight
Crystal system
Space group
a(Å)
Zn3L6 (1)
Cd3L6 (2)
Cu2L4 (3)
C102H66Cl6N6O6Zn3 C102H66Cl6N6O6Cd3 C68H44Cl4N4O4Cu2
1880.41
Monoclinic
P21
2021.50
Monoclinic
I2/c
1249.95
Monoclinic
P21/c
16.0776(9)
21.6907(9)
24.8601(1)
90
13.9862(6)
20.3381(1)
29.9964(1)
90
13.2890(1)
14.6353(1)
14.2812(10)
90
b(Å)
c(Å)
α(deg)
β(deg)
101.029(5)
90
91.454(4)
90
104.948(7)
90
γ(deg)
V (Å3)，Z
Dc (g·cm-3)
F(000)
8509.4(7), 4
1.468
8529.8(7), 4
1.574
2683.5(4), 2
1.574
3840
4056
1276
GOOF on F2
µ(mm-1)
1.025
1.020
0.995
1.089
0.991
1.050
Reflns collected/unique 42002/31275
19037/9835
0.0641
12652/6160
0.0832
Rint
0.0505
R1 , wR2 (I>2σ(I))
Flack parameter
0.0934/0.1922
0.605(5)
0.0924/0.1919
0.0995/0.2046
2
2 2
R1 =Σ││F0│-│Fc││ / F0│ . wR2 = {Σ[w(F0 -Fc)2]/Σ[w(F0 ) ]}1/2
Σ│
3. Result and discussion
3.1. Structural description of complexes 1–3
3.1.1. Crystal structure of complex 1
Single-crystal X-ray diffraction analysis reveals that complex 1 crystallizes in the
monoclinic P21 space group. Complex 1 consists of three Zn(II) ions and six L-
anions. As shown in Fig. 1, there are three crystallographically independent Zn(II)
ions (Zn1, Zn2 and Zn3), which show different coordination geometries (Scheme 2).

Zn1 is five-coordinated by the N atom from quinoline ring as the vertice, three
hydroxyl O atoms from three quinoline rings and one N atom from one quinoline ring
as the basal plane, forming a distorted rectangular pyramid geometry. Similar to Zn1,
Zn3 is also five-coordinated but in a trigonal bipyramid geometry by the hydroxyl O
atom as the vertice, two hydroxyl O atoms from two quinoline rings and two N atoms
from quinoline rings as the basal plane. While Zn2 is six-coordinated in a distorted
octahedral geometry, which is defined by four hydroxyl O atoms from four quinoline
rings and two N atoms from two quinoline rings. Three Zn (II) ions (Zn1, Zn2 and
Zn3) are bridged by two hydroxyl O atoms of ligands L- to construct a ‘V’-type
trinuclear cluster [Zn3O4] with the angle of 115.28° (Scheme 3), in which the Zn…Zn
distances are 3.293 and 3.222 Å. The adjacent ‘V’-type trinuclear clusters are further
connected by the intermolecular hydrogen bonds [C(71)–H(71)…Cl(5) = 3.406 Å] into
a 1D supramolecular chain (Fig. 2).
Fig. 1 Coordination environment of Zn(II) ions (In order to clearly show the
coordination environment of Zn, only show the quinoline ring of the ligand L-.)
Fig. 2 1D supramolecular chain formed by the hydrogen bonding weak interactions in
1 [C(71)–H(71)…Cl(5) = 3.406 Å].

3.1.2. Crystal structure of complex 2
X-ray diffraction analysis reveals that complex 2 crystallizes in the monoclinic
I2/c space group. The structure of complex 2 is similar with complex 1, as shown in
Fig. 3, there are two crystallographically independent Cd(II) ions (Cd1 and Cd2)
(Scheme 2). Cd1 is five-coordinated, resulting in a distorted rectangular pyramid
geometry with the equatorial plane occupied by the NO3 donors of three L- ligands
and the apical position by the N atom from quinoline ring. The coordination
environment of Cd2 is a distorted octahedron and the equatorial plane is occupied by
the NO3 donors of three L- ligands, while the apical position by one hydroxyl O atom
and a pyridine atom. Each two adjacent Cd(II) ions are bridged by two hydroxyl O
atoms to form a ‘V’-type trinuclear cluster [Cd3O4], in which the angle is 102.80° and
the Cd…Cd distance is 3.604 Å (Scheme 3).
Fig. 3 Coordination environment of Cd(II) (In order to clearly show the coordination
environment of Cd, only show the quinoline ring of the ligand L-.) Symmetry code:
#1 1 – x, y, 0.5 – z.
3.1.3. Crystal structure of complex 3
Complex 3 crystallizes in the monoclinic P21/c space group and it consists of
two Cu(II) ions and four L- anions. As shown in Fig. 4, there is only one
crystallographically independent Cu(II) ion (Cu1) (Scheme 2). Cu1 adopts a slightly
distorted rectangular pyramid geometry with the equatorial plane occupied by two
chelating NO donor sets from two L- ligands and the apical position by one hydroxyl
O atom of another L- ligand. Two Cu(II) ions also are linked by two hydroxyl O

atoms to form a dinuclear cluster [Cu2O2] with the Cu…Cu distances of 3.190 Å
(Scheme 3).
Fig.4 Coordination environment of Cu(II) (In order to clearly show the
coordination environment of Cu, only show the quinoline ring of the ligand L-.)
Symmetry code: #1 1 – x, 1 – y, 1 – z.
Scheme 2 Coordination geometries of all crystallographically independent metal ions
(Zn2+, Cd2+ and Cu2+) in complexes 1–3.
3.2. Effect of the central metals and reaction solvents on the structures of the title
complexes
It is well known that the central metal ions play an important role in the
formation of the final frameworks and various structures [15]. In this work, three
coordination compounds based on 8-hydroxyquinoline derivative ligand and different
metal centers (Zn(II), Cd(II), Cu(II)) have been obtained by solvothermal or solution

processing methods. When choosing DMF/C2H5OH/CH3CN as mixed solvents,
crystals 1 and 2 have formed with similar ‘V’-type trinuclear structure, but there are
subtle differences for the angles of ‘V’-type structure and coordination environments
(115.28° for complex 1, and 102.80° for complex 2) (Scheme 3). We hypothesized
that it may be derived from different ionic radii of the metal ions (rZn(II) = 74 pm, rCd(II)
= 95 pm). Under the similar reaction condition (T = 100℃), when we selected the
same solvent system (DMF/C2H5OH/CH3CN) for complexes 1 and 2, and just
changed the metal center into Cu(II), unfortunately, we could not obtain any suitable
crystals. Therefore, we tried other solvent system in the synthesis. Only when the
mixed solvents were replaced by DMF/THF, crystal 3 could be obtained at room
temperature with different dinuclear structure, whereas the solvothermal experiment
(DMF/THF system) carried at 100 ℃ could not achieve 3. Above results indicate that
the central metals, reaction solvents and temperature play important roles in the
formation of the multinuclear structures of complexes 1–3.

Scheme 3 The difference of the cluster structures of complexes 1–3.
3.3. Power X-ray diffraction (PXRD) and themogravimetric analysis (TGA)
In order to confirm the crystal structure of complexes 1–3 are truly representative
of their bulk materials, the PXRD experiments have been carried out on the
as-synthesized sample at room temperature. The PXRD experimental patterns of 1–3
match well with the patterns simulated from the single-crystal structure (Fig. 5),
confirming the high purity of bulky phase of those samples. The preferred orientation
of the powder sample may cause the differences in intensity [16].

Fig. 5 PXRD patterns of complexes 1–3: (a) calculated (b) experimental.
The thermal stability of ligand HL, the complexes 1–3 was examined by
thermogravimetric analysis (TGA) under a N2 atmosphere from 17 to 800 ℃ with a
heating rate of 0.5 ℃ min-1 (Fig. 6). Thermogravimetric analyses indicate all
compounds exhibit only one weight loss step which is attributed to the decomposition
of organic ligand. For ligand HL, the weight loss process is slow before 235 ℃, then
fell rapidly, and finished the degradation at 500 ℃. For complex 1, it didn’t lose
weight fast until 400 ℃. Similarly, complex 2 and complex 3 started to lose weight
fast until 450 ℃and 300 ℃, respectively. This indicates that combination of the metal
ions and ligand HL enhances their thermal stability, and the strength of the thermal
stability is HL＜complex 3＜complex 1＜complex 2. For complexes 1–3, the final
residues are ZnO, CdO and CuO, respectively.
Fig. 6 TGA curves for HL and complexes 1–3.

3.4. Luminescent Properties
Luminescent complexes are of great interest due to their various application in
chemical sensors, photochemistry, and light-emitting diode (LED) [17]. Therefore, the
soild-state luminescent properties of pure HL and complexes 1–3 are tested at room
temperature (Fig.7). When excited with 419 nm light, the free HL ligand exhibited a
emission peak at 585 nm, which originated from internal charge transfer [12c]. Upon
excitation at 420 and 390 nm, complexes 1 and 2 displays intense photoluminescence,
with emission maxima at 594 and 583 nm, respectively. Different from complexes 1
and 2, complex 3 displays fluorescence quenching. Compared with the free HL ligand,
the introduction of Zn(II) and Cd(II) to ligand HL led to a red-shift of 9 nm for
complex 1 and a blue-shift of 2 nm for complex 2, this may originate from π...π
transition [12a].
Fig. 7 Emission spectra of HL and complexes 1–3 in the solid state.
3.5. Electrochemical property of complex 3
Fig. 8 shows cyclic voltammograms of complex 3 at different scan rates, and
reduction and oxidation potentials for this dinuclear copper complex are summarized
in Table 2. It can be seen that two irreversible redox couples were observed in the
range of -1.5 to -0.5 V which could be attributed to the stepwise reduction of the Cu(II)
center, namely, the redox process is CuIICuII→CuICuII→CuICuI [18].

Fig. 8 Cyclic voltammograms of complex 3 in DMF (c = 2.0 × 10-4 M) (0.4 M
-
Bu4N+BF4 as supporting electrolyte).
Table 2 Electrochemical Data for 3 at the scan rate of 300 mV s-1.[ E(V) vs Fc+ / Fc]
E1pc
E2pc
E1pa
E2pa
Complex
3
-1.025
-1.296
-0.684
-1.108
4. Conclusion
In summary, we have successfully prepared three metal-organic coordination
compounds, namely, trinuclear structures for complexes 1 and 2, dinuclear structure
for
complex
3
which
based
on
8-hydroxyquinoline
derivative
(E)-2-[2-(4-chlorophenyl)vinyl]-8-hydroxyquinoline (HL). The central metals,
reaction solvents and temperature play important roles in the formation of complexes
1–3. Themogravimetric analysis indicates complexes 1–3 have good thermal
stabilities. The fluorescent properties show that complexes 1 and 2 may be potential
fluorescence materials. We believe this study demonstrates the effectiveness of
general solvothermal and solution processing methods which are influenced by the
nature of the solvent and reaction temperature. More variable parameters such as pH
values, stoichiometries and reaction concentrations, kinetic and thermodynamic
factors controlling the sequence of reaction steps will lead to diverse functional
crystalline materials. Future work will use different transition and rare earth metal
ions anticipating more specific coordination mode and systematic studies on the
different experimental parameters are actively pursued in the laboratory.

Appendix A.
CCDC
1415160, 1415158, 1415159 contains the supplementary
crystallographic data for 1, 2 and 3. These data can be obtained free of charge via
http://www.ccdc.cam.ac.uk/conts/retrieving.html, or from the Cambridge
Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: (+44)
1223-336-033; or e-mail: deposit@ccdc.cam.ac.uk.
Acknowledgments
The authors thank Ms. Lulu Rong for the initial contribution to this work.
Financial support from Qianjiang Talent Program of Zhejiang Province
(QJD1402007), the National Natural Science Foundation of China (21401077 and
21371078) is gratefully acknowledged.

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Graphical abstract
Three multinuclear metal-organic coordination compounds
based on 8-hydroxyquinoline derivative: syntheses, structures
and fluorescence properties

Synopsis
Three multinuclear metal-organic coordination compounds
based on 8-hydroxyquinoline derivative: syntheses, structures
and fluorescence properties
Three new metal-organic coordination polymers [Zn3L6] (1), [Cd3L6] (2) and [Cu2L4]
(3)
based
on
8-hydroxyquinoline
derivative
(E)-2-[2- (4-chlorophenyl)vinyl]-8-hydroxyquinoline (HL) have been obtained. 1 and
2 have similar ‘V’-type trinuclear structures whereas complex 3 displays dinuclear
structure. The effects of central metals and reaction solvents on the structures of 1–3
have been discussed.