一维链状Pb(Ⅱ)配位聚合物的制备、晶体结构及荧光性质

Synthesis,Crystal Structure and Fluorescence Property of a one-Dimensional Chain-Like Lead(Ⅱ) Coordination Polymer

以硝酸铅、对苯二甲酸、2,2’-联吡啶为原料,利用水热合成法制备了一种新型一维链Pb(Ⅱ)配位聚合物[Pb(TP)(2,2’-bipy)]_n(TP=对苯二甲酸,2,2’-bipy=2,2’-联吡啶)。通过X射线单晶衍射、元素分析、红外光谱、荧光分析等技术对目标配合物进行了结构及性质表征。结构分析表明,目标配合物属于三斜晶系,空间群为P-1,晶胞参数a=0. 94440 nm,b=0. 95273nm,c=1. 04054 nm,α=113. 179(3)°,β=80. 0140(3)°,γ=100. 774(3)°,V=0. 80677 nm^3,Z=2。对苯二甲酸配体上的两个羧基利用螯合配位模式分别连接两个Pb离子形成Z字形一维链状结构,一维链节点上的2,2’-联吡啶中两个吡啶环通过π-π堆积相互作用形成二维及三维超分子结构。荧光分析表明,配合物的荧光主要表现为配体的π~*→π跃迁。

One chain-like coordination polymer [Pb (TP)(2,2’-bipy)] n (TP = terephthalic acid,2,2 '- bipy = 2,2’- bipyridine) was synthesized under of hydrothermal reaction based on lead nitrate,terephthalic acid and 2,2 '-bipyridine.The structure and properties of the target complex were characterized by X-ray single crystal diffraction,EA,IR and fluorescence analysis. The X-ray crystallographic analysis reveals that complex 1 crystallizes in the triclinic system,space group P-1.The crystal cell parameters are a =0.9444nm, b =0.95273 nm, c =1.04054 nm ,α= 113.179 (3)°,β=80.0140 (3)°,γ= 100.774 (3)°, V =0.80677nm 3, Z =2,respectively.Both the two carboxylate groups of TP are adopt chelated coordination mode linking two Pb^2+ ions forming a 1D zigzag-like chain along a axis.The π-π packing interactions between the 2,2 '- bipy ligands from the adjacent 1D chains join the 1D chains into 3D supramolecular structure.The fluorescence property has been studied and could be attributed to the π→π transitions of ligands.