基于Ag+金属中心的硅钨杂多酸配位聚合物的合成及其电化学性能研究

本文利用水热合成法得到了一种基于银离子金属中心的硅钨杂多酸(H₃SiW₁₂O₄₀)配位聚合物材料(Ag₄(BPB)₄SiW₁₂O₄₀])(简称，化合物1).单晶X-射线衍射分析表明，结构中存在Ag1、Ag2和Ag3三种银离子，分别采用2、3、4配位的方式通过Ag-N键连接有机配体，又通过Ag-O键连接多酸分子. Ag1连接有机配体形成左手、右手螺旋链，并连接多酸分子形成梯形链. Ag2连接有机配体和多酸分子形成二维4,4-sql拓扑格子层，梯形链与格子层共用多酸分子. Ag3连接有机配体形成一维链贯穿于二维层，最终形成整体的三维结构.此外，利用复合改性玻碳电极(GCE)作为工作电极对材料的电化学性能进行了研究.电化学分析结果表明，材料可作为还原NaNO₃的电催化剂.

Synthesis and electrochemical properties of coordination polymer of silicotungstic heteropoly acid based on Ag+ metal center

In this work, a coordination polymer material (Ag4(BPB)4SiW12O40]) (Complex 1) based on silicotungstic heteropoly acid (H4SiW12O40) and silver ion metal center was synthesized by hydrothermal synthesis method. The single crystal X-ray diffraction analysis showed that there were three kinds of silver ions Ag1, Ag2 and Ag3 with coordination numbers of 2, 3, and 4, respectively. The Ag metal center is coordinated with N of the organic ligands and O of the polyacids. Ag1 connects organic ligands to form left- and right-handed helical chains, and connects polyacid molecules to form trapezoidal chains; Ag2 connects organic ligands and polyacid molecules to form a two-dimensional 4,4-sql lattice layer, sharing polyacid molecules with trapezoidal chains; Ag3 connects organic ligands to form one-dimensional chain through the two-dimensional layer, ultimately forming the overall three-dimensional structure. The electrochemical performance of the material was studied using a composite modified glassy carbon electrode (GCE) as the working electrode, and electrochemical analysis showed that the material can be used as an electrocatalyst for the reduction of NaNO3.