Syntheses, Structures, and Magnetic Properties of Two Novel Cobalt(II) Coordination Polymers Constructed from Pyridine‐2,6‐dicarboxylic Acid N‐oxide (PDCO)

Abstract

AbstractTwo new cobalt(II) coordination polymers, [Co(PDCO)(H2O)2]n (1) and [Co(PDCO)(bix)(2H2O)2·H2O]n (2) ( PDCO= pyridine‐2,6‐dicarboxylic acid N‐oxide, bix = 1,4‐bis(imidazol‐1‐ylmethyl)‐benzene) have been synthesized under hydrothermal conditions. Single‐crystal X‐ray analyses show that compound 1 is a 1D helical chainlike structure with 41 screw axes parallel to the crystallographic c‐axis and interchain hydrogen‐bonding interactions further result in a 3D framework; for compound 2, each bix ligand connects two Co1 atoms (or two Co2 atoms) to give a zigzag chain structure and these 1D chains are connected by offset face‐to‐face π···π and hydrogen bond interactions to generate a 3D architecture. The thermogravimetric analyses were investigated for 1 and 2. The determination of variable temperature magnetic susceptibilities indicates an antiferromagnetic interaction between the metal atoms for 1 and 2.