Syntheses, Structures And Properties Of Coordination Polymers Constructed Through (2,2'-(1,4-butanediyl)bis(1H-benzimidazole), Benzoimidazole-2-thiol)

Recently, coordination polymers and supramolecular architectures formed through the deliberate selection of metals and multifunctional ligands have received much attention for their fascinating structural diversity and specific functionality, which have made them highly promising in various applications, particularly absorption, catalysis and molecular magnetization. Rational design and synthesis of crystalline materials by selecting certain geometric metal ions and special organic ligands has achieved much progress. The aim of this work is to construct the coordination polymer through diverse ligands including benzimidazole groups (2,2'-(1,4-butanediyl)bis(1H-benzimidazole), benzoimidazole-2-thiol) with Zn2+, Cd2+ cations using the self-assembly and hydrothermal reaction. We character the crystal structures and the the fluorescence properties of the compounds, as well as survey the influence of the properties of ligands and metal cations on the structures of the compounds.1. Five different complexes based on d10 metal have been constructed with 2,2'-(1,4-butanediyl)bis(1H-benzimidazole) in the presence of the additional ligands Benzenedicarboxylate (bdc) anions. The benzenedicarboxylate (bdc) anions have three structural isomers1,2-bdc, 1,3-bdc, and 1,4-bdc with different angles between the two carboxylate groups. So we investigate the photoluminescent properties of several complexes, and we survey the influence of the radius of the metal ions and the angles between the two carboxylate groups of bdc ligands on the structures. [Zn(H2C4BIm)(1,2-bdc)]n 1 [Cd(H2C4BIm)(1,2-bdc)·(H2O)]n 2 [Zn(H2C4BIm)(1,3-bdc)]n 3 [Cd(H2C4BIm)(1,3-bdc)]n 4 [Zn3(H2C4BIm)(1,4-bdc)3]n 52. Oxalic acid and tartaric acid as other two opposite additional ligands were imported to the 2,2'-(1,4-butanediyl)bis(1H-benzimidazole) complexes systerm. We obtain 4 complexes, in which compound 6 is one dimensional (1D) chain, and the other are 3D complexes with diamond topology. The complexes 8 and 9 are isomorphous and chiral. We discuss the radius of the metal ions and the length of the additional ligands on the 4 complexes. The fluorescence properities were also researched. [Zn(H2C4BIm)(ox)]n 6 [Cd(H2C4BIm)(ox)]n 7 [Zn(H2C4BIm)( C4H4O6)]n 8 [Cd(H2C4BIm)( C4H4O6)]n 93. Two else complexes have been constructed with 2,2'-(1,4-butanediyl)bis(1H-benzimidazole) in the presence of the additional ligands Cl- and NCS-. One complex is 1D chain, the other are 2D plane net with 4.82 topology. Cl- and NCS- are both as terminal ligands. At last, we investigate the fluorescence properties. {[Cd(H2C4BIm)Cl2]·(H2C4BIm)}n 10 [Cd(HC4BIm)(NCS)]n 114. In the presence of the additional ligands 4,4'-bipyridine, two novel complexes were constructed using benzoimidazole-2-thiol ligand and diverse CdII salts. The complex is 1D double-helical chain when the CdII salt is acetate, and the complex is a 3D complex with 1D chains digging into the jejunum when the CdII salt is sulphate. The fluorescence properities were also researched. {[Cd2(MBZIM)4]·(4,4'-bpy)}n 12 {[Cd(4,4'-bpy)2(H2O)2]·[Cd(4,4'-bpy)(H2O)2(MBZIM)2]·(MBZIM)2·(SO4)2·(H2O)}n 13...