Self-assembly of three d10 metal coordination polymers based on a flexible bis(2-methylbenzimidazole) and dicarboxylate co-ligands
摘要:
Hydrothermal self-assembly of zinc nitrate with 1,1'-(1,3-propane)bis-(2-methylbenzimidazole) (pbmb) and different dicarboxylic acid ligands gave rise to three new coordination polymers [Zn(pbmb)(hmph)](n) (1), {[Zn-2(pbmb)(chdc)(2)]center dot 0.5H(2)O}(n) (2), [Zn(pbmb)(mip)](n) (3) (H(2)hmph = homophthalic acid, H(2)chdc = 1,4-cyclohexanedicarboxylic acid and H(2)mip = 5-methylisophthalic acid). Both complexes 1 and 3 possess 2D {6(3)} framework and further extend into 3D supramolecular network via C-H center dot center dot center dot O hydrogen bonding or pi-pi stack interactions. While 2 is a 1D double loop-like chain structure, which arranged into a 2D network through C-H center dot center dot center dot O hydrogen bonding interactions. Three compounds all exhibit strong photoluminescence at room temperature in solid state and may be good candidates for potential luminescence materials. (C) 2014 Elsevier B.V. All rights reserved.