Two Co(II) compound constructed by phthalic acid and 3-Cl-phthalic acid: Synthesis, structure, and magnetic properties

Abstract In this paper, we obtained two novel 2D layered cobalt coordination polymers, namely [(Co(o-BDC)] n ( 1 ) and (Co(3-Cl-o-BDC)] n ( 2 ), through solvothermal method with acetone as solvent based on phthalic acid (o-H 2 BDC) and 3-chloro-phthalic acid (3-Cl-o-H 2 BDC) respectively. Due to the steric hindrance effect of chloric substituent, the two ligands revealed different coordination modes. And cobalt centers of 1 and 2 showed CoO 6 octahedral and CoO 4 tetrahedral configurations respectively. As a result, 1 and 2 revealed different layered constructions: a 5-connected topology with 4 8 .6 2 Schlafli symbol for 1 , and a 4-connected topology with 4 4 .6 2 Schlafli symbol for 2 , respectively. Besides, Compound 1 and 2 reveal ferromagnetic and antiferromagnetic behaviors, respectively.