一维配位聚合物{[Cu(tzda)(H_2O)_3]·3.5H_2O}_n的合成、晶体结构及电化学性质

Synthesis,Crystal Structure and Electrochemical Property of a 1D Coordination Polymer {[Cu(tzda)(H_2O)_3]·3.5H_2O}_n

合成了一维配位聚合物{[Cu(tzda)(H2O)3].3.5H2O}n(H2tzda为1,3,4-噻二唑-2,5-二硫代乙酸),对其结构进行了红外、元素分析和X射线单晶衍射测定.配合物属单斜晶系,空间群C2/c,晶胞参数a=1.907 3(12)nm,b=0.713 4(4)nm,c=2.363 5(15)nm,β=91.378 0(10)°,Z=8.金属中心Cu(Ⅱ)离子呈现出五配位,处于四角锥的配位环境;配体阴离子tzda2-采用双(单)齿配位模式将Cu(Ⅱ)离子连接成一维链状结构.配合物的电化学研究表明:在-0.3～0.4 V电位范围内,Cu2+/Cu+电对在电极上的氧化还原反应过程是准可逆过程且受扩散控制.

A new 1 D coordination polymer, {[Cu（tzda）（H2O）3]·3.5H2O}n [ H2tzda = （ 1,3,4-thia- diazole-2,5-diyldithio） diacetic acid], was synthesized and characterized by IR, elemental analysis and X-ray single crystal diffraction. The title complex crystallized in monoclinic space group C2/c, with a = 1.907 3（12） nm,b=0.713 4（4） nm,c=2.3635（15） nm,fl =91.378 0（10）° andZ=8. In the complex, each Cu （ II ） ion was five-coordinated in a distorted quadrangular pyramid geometry, and tzda2- ligands bridged Cu （ II ） ions to form 1 D chains in bis-monodentate fashion. Electrochemical study on the complex showed that the redox process （ Cu2 ＋/Cu＋ ） in the potential range of - 0.3 to 0.4 V was quasi-reversible and controlled by the diffusion.