Citation: GAO Gui-Yuan, SUN Li-Na, FENG Chao, QU Zhi-Rong, FAN Yan, ZHAO Hong. Synthesis, Crystal Structure and Thermal Stability of a New Cadmium(Ⅱ) Polymer Based on 1H-pyrazole-3-carboxylic Acid Ligand[J]. Chinese Journal of Structural Chemistry, ;2015, 34(4): 611-618. doi: 10.14102/j.cnki.0254-5861.2011-0541 shu

Synthesis, Crystal Structure and Thermal Stability of a New Cadmium(Ⅱ) Polymer Based on 1H-pyrazole-3-carboxylic Acid Ligand

GAO Gui-Yuan ^a ,
SUN Li-Na ^a ,
FENG Chao ^a ,
QU Zhi-Rong ^b,, ,
FAN Yan ^b ,
ZHAO Hong ^a,,

a.
a. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China;
b.
b. Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China

Corresponding author: QU Zhi-Rong, ZHAO Hong,
Received Date: 23 October 2014
Available Online: 11 December 2014
Fund Project: This work was supported by the National Natural Science Foundation of China (No. 20801012) (No. 20801012)New Energy Technology Co. Ltd. of Ai Naji of Jiangsu Province (No. 8507040091) (No. 8507040091)

A novel Cd(Ⅱ) coordination polymer, [CdCl(Hpc)H₂O]_n (1, H₂pc=1H-pyrazole-3-carboxylic acid), was synthesized by the reaction of CdCl₂·2.5H₂O with H₂pc, and structurally characterized by IR spectrum, UV-Vis spectrum, elemental analysis, single-crystal X-ray diffraction, as well as thermal analysis. Compound 1 crystallizes in monoclinic, P2₁/n space group with a=7.0304(3), b=10.3047(3), c=10.6446(4)Å, β=107.174(4)°, V=736.78(5)Å³, Z=4, C₄H₅CdClN₂O₃, M_r=276.95, D_c=2.497 g/cm³, F(000)=528.0, μ=3.281 mm^-1, R=0.0169 and wR=0.0387. The central metals adopt distorted octahedral geometry. Carboxyl groups of the ligand connect Cd(Ⅱ) into a one-dimensional chain, which further constructs a two-dimensional network by halogen bridging. Such two-dimensional structures are finally connected into a three-dimensional supramolecular architecture due to the hydrogen bonds and intermolecular π-π interactions. In addition, complex 1 has high thermal stability.
- Cd(Ⅱ) coordination polymer,
- pyrazolecarboxylic acid,
- crystal structure,
- supramolecular architecture,
- thermal stability
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