Syntheses, structures, luminescent and photocatalytic properties of two Zn(II) coordination polymers assembled with mixed bridging N-donors and 2-(4-carboxyphenyl)-4,5-imidazole dicarboxylic acid ligand

摘要

Two new Zn(II) coordination polymers with the formulas of {[Zn-3(HCpIDC)(2)(4,4'-biPy)(H2O)]center dot 4H(2)O}(n) (1) and {[Zn-2(CpIDC)(BIMB)]center dot H2O}n (2) [H4CpIDC = 2-(4-carboxyphenyl)-4,5-imidazole dicarboxylic acid, 4,4'-bipy = 4,4'-bipyridine, and BIMB = 1,4-bis(1-imidazolyl)benzene] have been successfully synthesized. Both complexes 1 and 2 feature 3D frameworks in which the IDC groups of HCpIDC3- and CpIDC4- ligands link metal nodes leading to infinite 21 helical chains. The HCpIDC3- and CpIDC4- anions exhibit two coordination modes (mu(4) -kN,O: kN',O': kO '',O ''': kO '''' and mu(5)-kN,O: kN',O': kO '',O ''': kO '''': kO) in different coordination environments. Further structural analyses show that 1 and 2 are topologically bimodal 4-connected net and trinodal (3,4,6)-connected net, respectively. As is expected, two complexes with good thermal stability displayed strong fluorescence emissions in the solid state at the room temperature. Moreover, complex 1 has some extent of photocatalytic activities for RhB. (C) 2017 Elsevier B.V. All rights reserved.