Synthesis and Properties of a One-Dimensional Mixed-Ligand Cd(Ⅱ) Complex with Helical Structure  

作　　者：余立琼 黄如丹 迟瑛楠 许颜清 胡长文 

机构地区：[1]School of Science ,Beijing Institute of Technology

出　　处：《Journal of Beijing Institute of Technology》2009年第1期79-83,共5页北京理工大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China (20371007 ,20476011 ,20771013);Excellent Young Scholars Research Fund of Beijing Institute of Technology(2006Y0715)

摘　　要：The title complex, [ [ Cd（Him） （OH-BDC） （H2O）2 ]· 3H2O]n （ 1 ） （Him is imidazole, OH-H2BDC is 5-hydroxyisophthalic acid）, was synthesized by liquid/liquid diffusion method at room temperature. The complex crystallizes in orthorhombic, space group P212121, with a = 0.671 6 （7）, b = 1.380 6 （2）, c = 1.7421（2） nm, V = 1.615 2（3） nm3, C11H18CdN2O10, Mr = 450.67, Dc = 1.853 g/cm3, μ = 1.407 mm^-1, F（000） = 904, Z = 4, the final R1 = 0.020 9 and wR2 = 0.045 3 for 3 211 observed reflections （Ⅰ 〉 2σ （Ⅰ））. In the structure of 1, the OH-BDC ligands exhibiting bis-bidentate coordination mode bridge the adjacent Cd centers to form a one-dimensional helical chain and the second ligand Him acting as terminal ligands are attached to the helical chain. It is notable that a series of complicated hydrogen bonds （e. g., N-H… O, O-H… O） exist in the structure, which link neighboring helices into a three-dimensional supramolecular architeeture. An observed intense blue luminescence with an emission band peaking at 390 nm for 1 may be resulted from ligand-to-metal charge transfer （LMCT）.The title complex, [ [ Cd（Him） （OH-BDC） （H2O）2 ]· 3H2O]n （ 1 ） （Him is imidazole, OH-H2BDC is 5-hydroxyisophthalic acid）, was synthesized by liquid/liquid diffusion method at room temperature. The complex crystallizes in orthorhombic, space group P212121, with a = 0.671 6 （7）, b = 1.380 6 （2）, c = 1.7421（2） nm, V = 1.615 2（3） nm3, C11H18CdN2O10, Mr = 450.67, Dc = 1.853 g/cm3, μ = 1.407 mm^-1, F（000） = 904, Z = 4, the final R1 = 0.020 9 and wR2 = 0.045 3 for 3 211 observed reflections （Ⅰ 〉 2σ （Ⅰ））. In the structure of 1, the OH-BDC ligands exhibiting bis-bidentate coordination mode bridge the adjacent Cd centers to form a one-dimensional helical chain and the second ligand Him acting as terminal ligands are attached to the helical chain. It is notable that a series of complicated hydrogen bonds （e. g., N-H… O, O-H… O） exist in the structure, which link neighboring helices into a three-dimensional supramolecular architeeture. An observed intense blue luminescence with an emission band peaking at 390 nm for 1 may be resulted from ligand-to-metal charge transfer （LMCT）.

关 键 词：MIXED-LIGAND HELIX hydrogen bonds LUMINESCENCE 

分 类 号：O614.242[理学—无机化学]