Two 1-D zinc(II) coordination polymers based on flexible bis(2-methylbenzimidazole) and rigid dicarboxylate co-ligands.

Two coordination polymers, {[Zn(bbi)(pydca)]·2H2O}n(1) and [Zn(bmb)(1,3-bdc)]n(2), where (bbi?=?1,1?-(1,4-butanediyl)bis(2-methylbenzimidazole), H2pydca?=?pyridine-2,6-dicarboxylic acid, bmb?=?1,3-bis(2-methylbenzimidazol-1-ylmethyl)benzene and 1,3-H2bdc?=?1,3-benzenedicarboxylic acid), have been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, and powder and single-crystal X-ray diffraction. Structural analysis showed that1is a 1-D zigzag chain coordination polymer, which is further linked into a 3-D supramolecular framework via classical O–H?O hydrogen bonding interactions. In2, the 1-D loop-like chains are additionally assembled by four C–H??hydrogen bond interactions to construct a 3-D supramolecular network. The thermal stabilities and fluorescence properties of the complexes were investigated. [ABSTRACT FROM AUTHOR]