The role of chlorine interactions in the construction of nickel(ll) and cobalt(II) supramolecular metal-organic frameworks based on mixed tetrachloroterephthalate and 2,2'-bipyridine ligands

摘要

Reactions of the rigid ligand 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid (H_2BDC-Cl_4) with nickel(ll) and cobalt(ll) metal salts in the presence of 2,2'-bipyridine in DMF/MeOH afforded [M(BDC-Cl_4)(2,2'-bpy)(MeOH)_2]_n (M = Ni or Co). The Ni complex has a one-dimensional (1-D) linear structure that is further extended into a three-dimensional (3-D) supramolecular framework by inter-chain C-H…Cl hydrogen bonds, whereas the Co compound shows a 1-D zigzag structure, which is further assembled into a 3-D supramolecular architecture through intermolecular C一H…CI and Cl -Cl interactions. These results reveal that weak chlorine interactions play an important role in governing these supramolecular structures, Thermal and fluorescence properties have also been investigated