title: A three-dimensional CdII coordination polymer constructed from 1,1'-biphenyl-2,2',5,5'-tetracarboxylate and 1,4-bis(1H-imidazol-1-yl)benzene ligands.
abstract: The title coordination polymer, poly[[aqua(μ5-1,1'-biphenyl-2,2',5,5'-tetracarboxylato)bis[μ2-1,4-bis(1H-imidazol-1-yl)benzene]dicadmium(II)] dihydrate], {[Cd2(C16H6O8)(C12H10N4)2(H2O)]·2H2O}n, was crystallized from a mixture of 1,1'-biphenyl-2,2',5,5'-tetracarboxylic acid (H4bpta), 1,4-bis(1H-imidazol-1-yl)benzene (1,4-bib) and cadmium nitrate in water-dimethylformamide. The crystal structure consists of two crystallographically independent Cd(II) cations, with one of the Cd(II) cations possessing a slightly distorted pentagonal bipyramidal geometry. The second Cd(II) centre is coordinated by carboxylate O atoms and imidazole N atoms from two separate 1,4-bib ligands, displaying a distorted octahedral CdN2O4 geometry. The completely deprotonated bpta(4-) ligand, exhibiting a new coordination mode, bridges five Cd(II) cations to form one-dimensional chains via μ3-η(1):η(2):η(1):η(2) and μ2-η(1):η(1):η(0):η(0) modes, and these are further linked by 1,4-bib ligands to form a three-dimensional framework with a (4(2).6(4))(4.6(2))(4(3).6(5).7(2)) topology. The structure of the coordination polymer is reinforced by intermolecular hydrogen bonding between carboxylate O atoms, aqua ligands and crystallization water molecules. The solid-state photoluminescence properties were investigated and the complex might be a candidate for a thermally stable and solvent-resistant blue fluorescent material.
authors.affiliation: Key Laboratory of Chemical Biology and Molecular Engineering of the Education Ministry, Institute of Molecular Science, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Su
authors.affiliation: Key Laboratory of Chemical Biology and Molecular Engineering of the Education Ministry, Institute of Molecular Science, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Lu
keywords: 1,1′-biphenyl-2,2′,5,5′-tetracarboxylate; 1,4-bis(1H-imidazol-1-yl)benzene; crystal structure; hydrogen bonding; three-dimensional coordination polymer; topological analysis