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

Abstract

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 that 1 is 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. In 2, the 1-D loop-like chains are additionally assembled by four C–H⋯π hydrogen bond interactions to construct a 3-D supramolecular network. The thermal stabilities and fluorescence properties of the complexes were investigated.

Graphical Abstract

Keywords:

• Bis(benzimidazole)
• Crystal structure
• Fluorescence properties
• Zn(II) coordination polymers