吡啶-2,5-二羧酸镍(Ⅱ)配位聚合物合成及热动力学分析

Synthesis, Crystal Structure and Thermal Studies of Ni(Ⅱ) Coordination Polymers with Poridine-2,5-dicarboxylic Acid

采用水热法合成了配位聚合物{[Ni(pydc)(H_2O)_3]·2H_2O}_n(H_2pydc=吡啶-2,5-二羧酸)。用元素分析、红外光谱以及X射线单晶衍射分析确定了配合物的晶体结构。结果显示,该配合物为三斜晶系,P-1空间群。该配合物中配体pydc^(2-)的一个羧基以双齿桥连方式与两个相邻的Ni(Ⅱ)离子配位,另一个羧基未参与配位。配合物分子为1D链状结构,链状结构的分子通过氢键连接成3D网络结构。对该配合物的热分解过程进行了分析,得出了分解过程的动力学参数。

A novel coordination polymers{[Ni(pydc)(H2O)3]·2H2O}n(H2pydc=2,5-pyridinedicarboxylic acid)was synthesized byhydrothermal reaction.Its crystal structures was characterized by elemental analysis,IR spectra and single crystal X-ray diffractionmethod.The analyses indicated that the complex belonged to triclinic system,space group P-1.In the complex,one carboxylategroup of pydc2-ligand acted as a bidentate ligand,linking two neighboring Ni(Ⅱ)ions,and the other carboxylate group was notparticipate in the coordination.The complex possessed1D structure.It was networked into3D structures with hydrogen bonds.Inaddition,thermal stability and dynamics of the title complex was analyzed and the pyrolysis kinetic parameters were obtained.