两个基于氢键构筑的超分子镁配合物的合成、 晶体结构及荧光性质

摘要

Two structurally diverse magnesium centered complexes with formula [Mg(Hbidc)(H2O)4](1) and [Mg(Hbidc)(H2O)5]·4H2O(2), constructed from multidentate ligand 1H-benzimidazole-5,6-dicarboxylic acid(H3bidc), were synthesized under hydrothermal conditions with identical reactants at different temperatures.The complexes were characterized by Fourier transform infrared(FTIR) spectroscopy, elemental analysis, thermogravimetric analysis(TGA), and powder and single-crystal X-ray diffraction(XRD) analyses.Complexes 1 and 2 both display neutral mononuclear structures, and their distinct crystal packing patterns are driven by strong intra-or inter-molecular hydrogen bonds.Interestingly, unprecedented hydrogen-bonded cyclic tetrameric water clusters(H2O)4 are observed in complex 2.In addition, luminescent studies show that the title compounds exhibit intense blue fluorescence emissions at room temperature in the solid state.%以5,6-苯并咪唑二酸(H3bidc)为有机配体, 在水热条件下通过控制反应温度得到了2个镁配合物[Mg(Hbidc)(H2O)4](1) 和 [Mg(Hbidc)(H2O)5]·4H2O(2).通过单晶及粉末X 射线衍射、 红外光谱、 元素分析和热重分析对配合物进行了表征.结果表明, 配合物1和2均为单核分子, 分别以不同的堆积方式通过氢键构筑成三维超分子结构.值得注意的是, 配合物2的结构中捕获了由氢键连接的环状四聚体水簇(H2O)4.配合物1和2的电荷布居分析结果与晶体结构的讨论一致.此外, 固体荧光分析表明, 配合物1和2在室温下具有较强的蓝光发射.