A three-dimensional Zn^II coordination polymer constructed from 1,1′-biphenyl-2,2′,4,4′-tetracarboxylate and 1,4-bis(1H-imidazol-1-yl)benzene ligands exhibiting photoluminescence

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• 作者：Feng Su ; Liping Lu ; Chengyong Zhou ; Xiaoxia Wang ; Long Sun and Chun Han
• 关键词：three-dimensional coordination polymer ; zinc complex ; 1 ; 1&prime ; -biphenyl-2 ; 2&prime ; 4 ; 4&prime ; -tetracarboxylate ; 1 ; 4-bis(1H-imidazol-1-yl)benzene ; crystal structure ; tetrahedral coordination ; topological analysis ; fluorescence properties
• 刊名：Acta Crystallographica Section C
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：73
• 期：2
• 页码：72-77
• 全文大小：1179K
• ISSN：1600-5759

文摘

Ligands based on polycarboxylic acids are excellent building blocks for the construction of coordination polymers; they may bind to a variety of metal ions and form clusters, as well as extended chain or network structures. Among these building blocks, biphenyltetracarboxylic acids (H₄bpta) with C₂ symmetry have recently attracted attention because of their variable bridging and multidentate chelating modes. The new luminescent three-dimensional coordination polymer poly[(μ₅-1,1′-biphenyl-2,2′,4,4′-tetracarboxylato)bis[μ₂-1,4-bis(1H-imidazol-1-yl)benzene]dizinc(II)], [Zn₂(C₁₆H₆O₈)(C₁₂H₁₀N₄)]_n, was synthesized solvothermally and characterized by single-crystal X-ray diffraction, elemental analysis and IR spectroscopy. The crystal structure contains two crystallographically independent Zn^II cations. Both metal cations are located on twofold axes and display distorted tetrahedral coordination geometries. Neighbouring Zn^II centres are bridged by carboxylate groups in the syn–anti mode to form one-dimensional chains. Adjacent chains are linked through 1,1′-biphenyl-2,2′,4,4′-tetracarboxylate and 1,4-bis(1H-imidazol-1-yl)benzene ligands to form a three-dimensional network. In the solid state, the compound exhibits blue photoluminescence and represents a promising candidate for a thermally stable and solvent-resistant blue fluorescent material.