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Synthesis, Structure and Dielectric Properties of Cyanide Cobalt(Ⅲ) Hydrogen-Bonding Cage-like Supramolecular Crystal
Author NameAffiliationE-mail
ZHENG Xiao-Yuan Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China  
LIU Yang Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China liuyangxj85@163.com 
QIN Liu-Lei Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China  
YU Fei-Fan Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China  
ZHU Chun-Li Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China  
LIU Zun-Qi Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China zunqi85@163.com 
Abstract: Using o-chloroaniline(o-CA), 18-crown-6 and cobalt cyanide as reactant, a small-molecule metal complex (H)0.5(o-CAH)[Co(CN)6]0.5·(18-crown-6)0.5·H2O (1) was synthesized by evaporation in the mixed solution of methanol and water. The structure and electrical properties of 1 were characterized by single crystal X-ray diffraction, infrared spectroscopy, thermogravimetric analysis (TG) and dielectric measurements. The results showed that 1 crystalizes in the triclinic system with the space group P1 at low-temperature (100 K). The cell parameters are as follows:a=0.869 22(1) nm, b=0.964 09(12) nm, c=1.129 93(14) nm, α=77.894 0(10)°, β=78.877 0(10)°, γ=88.684 0(10)°. Single crystal X-ray diffraction show a three-dimensional cage-like structure through hydrogen bonds of cyanide cobalt, supramolecular cations and water molecules. When the temperature changed, the space between the cobalt atoms of the cage-like vertex showed significant stretching deformation, which resulted in the distinct dielectric anomaly observed around 260 K.
Keywords: crystal structure  hydrogen bond  metal organic  dielectric property
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ZHENG Xiao-Yuan,LIU Yang,QIN Liu-Lei,YU Fei-Fan,ZHU Chun-Li,LIU Zun-Qi.Synthesis, Structure and Dielectric Properties of Cyanide Cobalt(Ⅲ) Hydrogen-Bonding Cage-like Supramolecular Crystal[J].Chinese Journal of Inorganic Chemistry,2019,35(2):277-284.
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Chinese Journal of Inorganic Chemistry