刚性配体1,3,5-三(1-咪唑基)苯与1,2,4-苯三甲酸构筑的金属配合物:水热合成及晶体结构

摘要

Two new coordination complexes [Co(1,2,4-HBTC)(tib)] (1) and [Ni4(1,2,4-BTC)2(tib)4(H2O)j ·(1,2,4-HBTC) ·9H20 (2) (1,2,4-H3BTC=l,2,4-benzenetricarboxylic acid, tib=l,3,5-tris(1-imidazolyl)benzene) were obtained by hydrothermal reactions of 1,2,4-H3BTC and tib with corresponding metal salts. Single crystal X-ray diffraction analysis revealed that each tib ligands connect three metal atoms to form two-dimensional (2D) networks in 1 and 2. On the other hand, each 1,2,4-HBTC2- coordinates to one Co(Ⅱ) atom as a terminal ligand in 1, while in 2, two 1,2,4-BTC3- ligands link four Ni(Ⅱ) atoms which further connect [Ni(tib)]2+ 2D networks to result in formation of multi-layered 2D structure. Complexes 1 and 2 are finally extended to three-dimensional (3D) supramolecular structures by hydrogen bonding interactions.%由水热法合成了2个配合物[Co(1,2,4-HBTC)(tib)](1)和[Ni4(1,2,4-BTC)2(tib)4(H2O)2]·(1,2,4-HBTC)·9H2O(2)(1,2,4-H3BTC=1,2,4-苯三甲酸,tib=1,3,5-三(1-咪唑基)苯),并用元素分析、红外光谱、X-射线单晶衍射及热重分析等对其进行了表征.晶体结构分析结果表明:配合物1是由Co(Ⅱ)和tib连接形成的二维层状结构,1,2,4-HBTC2-作为端基配体与Co(Ⅱ)配位,而配合物2是通过1,2,4-BT℃3-连接[Ni(tib)]2+二维网形成最终的二维多层结构,这2个化合物最终均被氢键连接形成三维超分子结构.