离子化合物[2,6-bis(Benzimidazol-2-yl)pyridineH_2]^(2+)·[SbCl_5]^(2-)的合成、晶体结构及荧光性质

Synthesis,Crystal Structure and Fluorescence Spectrum of a Ionic Compound [2,6-bis(Benzimidazol-2-yl)pyridineH_2]^(2+)·[SbCl_5]^(2-)

利用邻苯二胺、2,6-吡啶二甲酸与三氯化锑在盐酸溶液中经水热反应,合成了一种新的离子型化合物[2,6-bis(Benzimidazol-2-yl)pyridineH2]2+.[SbCl5]2-。通过化学分析、元素分析、热重分析、红外光谱及荧光光谱对结构和性质进行了表征,用X-射线单晶衍射测定了该化合物的晶体结构。化合物的晶体属三斜晶系,P1空间群。Sb3+与其周围5个氯离子配位,构成一个畸变四方锥构型[SbCl5]2-配位结构,2个配阴离子[SbCl5]2-之间通过Sb(1)…Cl(1)ii次级键形成四元环状结构,并与2,6-二(苯并咪唑-2′)吡啶两价阳离子,通过离子键及氢键形成三维网状离子化合物晶体。该化合物具有很好的荧光特性。

A ionic compound [2,6-bis（Benzimidazol-2-yl）pyridineH2]^2＋·[SbCl5]^2- was synthesized by the hydrothermal reaction of o-phenylenediamine,pyridine-2,6-dicarboxylic acid with SbCl3 in 1∶1 HCl solution.The compound was characterized by chemical analysis,elemental analysis,TG-DTA,fluorescence spectrum and IR spectra.The single crystal structure was determined by X-ray single crystal diffraction.It crystallizes in triclinic system,space group P-↑1 with：α=0.987 2（10）nm,b=1.133 32（11）nm,c=1.182 4（2）nm,α=108.269（10）°,β=100.807（10）°,γ=107.52 3（10）°,Z=2,V=1.138 4（3）nm^3,Dc=1.786 g·cm^-3,μ=1.816 mm^-1,F（000）=600,R1=0.022 0,wR2=0.057 1.The single crystal structure indicates that the antimony ion to five Cl^-forms a coordination structure of distorted square pyramid.Two [SbCl5]^2- form four-member ring by scondary bonding Sb（1）…Cl（1）^ⅱ,and the four-member ring with 2,6-bis（Benzimidazol-2-yl）pyridine cation forms the three-dimensional reticulation ionic crystal by ionic bonds and hydrogen bonds.It has been proved that the title compound has fluorescence behaviour.