一种银配合物的合成、晶体结构和荧光性质

Synthesis,Crystal Structure and Fluorescent Property of a Silver Coordination Compound

用扩散法合成了一种新的银配合物—[Ag(mtyaa)]2·5(H2O)(mtyaa=2-(5-甲基-1,3,4-噻二唑)-硫乙酸阴离子),用X射线单晶衍射仪测定了配合物的单晶结构,并对它进行了元素分析、红外光谱、热重、荧光和粉末X射线衍射等表征。配合物属于三斜晶系,P 1空间群。晶胞参数为:a=0.8473(4)nm,b=1.0620(5)nm,c=1.2055(6)nm,α=102.321(8)°,β=99.951(9)°,γ=96.298(9)°,V=1.0317(9)nm3,Z=2,Dc=2.203 g/cm3,F(000)=676,R1=0.0670,wR2=0.1558。在配合物中mtyaa配体采取两种配位模式。四配位的银离子通过mtyaa的端机氮原子和硫原子桥连形成一个二维结构,此二维结构又通过大量的氢键形成三维网络结构。本文研究了标题配合物的荧光性能。荧光测试表明,配合物在350 nm波长的光激发下在467和492 nm出现了两个弱发射峰,在530 nm处出现了一个较宽的发射带。

A new silver coordination compound [Ag（mtyaa） ]2.5（H2O） （ mtyaa： 2-（5-methyl-1, 3,4- thiadiazol-2-ylthio） acetic acid anion） has been synthesized by diffusion method and characterized by single- crystal X-ray diffraction, elemental analysis, FYIR spectroscopy, thermal analysis and powder X-ray diffraction. The crystal belongs to a triclinic system with a P 1- space group. The cell parameters are ： a = 0.8473（4） nm, b=1.0620（5） nm, c=1.2055（6） nm, a=102.321（8）°, β=99.951（9）°, γ= 96. 298（9）°, V= 1. 0317（9） nm3, Z =2, Dc =2. 203 g/cm3, F（000） =676, R, =0. 0670, wR2 =0. 1558. The mtyaa ligand takes two kinds of coordination modes and the tetracoordinated Ag center is bridged by an endocyclic nitrogen atom and a sulfur atom from the adjacent mtyaa ligand to form a two dimensional structure. The two dimensional structure is further linked to a three dimensional network by numerous hydrogen bonds. The fluorescent property of the title compound was discussed. The result shows that the title compound exhibits two weak emission peaks at 3,67 and 492 nm and one broad emission band with a maximum at ca. 530 nm when the excitation wavelength is 350 nm.