一维硫酸镉-双咪唑配合物的合成、结构及谱学性质研究

采用水热合成的方法,得到一种新颖镉的配合物{[Cd(H2biim)2(SO4)].3H2O}n(1,H2biim=2,2’-biimidazole)。通过X-ray单晶衍射分析可知,在该化合物中,SO24-桥连Cd(Ⅱ)离子在c轴上形成"之"字形一维无机CdSO4链。双咪唑配体通过与镉的配位作为支链悬挂在链的两侧,链与链之间分别通过π—π堆积和氢键作用,拓展为三维超分子网络。二维红外相关光谱分析表明SO24-的对称伸缩振动及咪唑环上的N—C伸缩和反伸缩振动,以及NC伸缩振动对热微扰均有响应。稳态荧光分析显示,配合物在397nm光激发下,在498nm处出现了强的蓝光,该发射带归属为配体到金属的荷移跃迁。

Synthesis, Structure and Special Study of 1D Cadmium Sulfate-H2biim Coordination Polymer

A novel cadmium complexes of {[Cd(H2biim)2(SO4)]·3H2O}n(1)(H2biim=2,2’-biimidazole) was synthesized by hydrothermal reaction of 3CdSO4·8H2O and 2,2’-biimidazole ligand.The complex was built up by [Cd(H2biim)2]2+ units bridged sequentially by SO2-4 anions to form 1D zigzag chains parallel to the c-axis.The H2biim ligands were attached to the 1D chain as branches of the chain by coordinating to Cd2+ at two sides of the chain.The chains were held together by π—π interaction and O—H…O interactions,thus yielding a 3D extended supramolecular network.The responses of symmetric stretching vibration of SO2-4,N—C single bond,NC double bond and anti-symmetric stretching vibration of N—C single bond were detected in 2D IR correlation spectra under thermal perturbation.The complex exhibited strong blue emission peak at 498 nm(λex=397 nm) that can be assigned to a ligand-to-metal charge-transfer(LMCT) band.