Synthesis, Crystal Structure, and Magnetic Properties of Two Manganese(II) and Cobalt(II) Coordination Polymers Based on Biphenyl-3,3',4,4'-tetracarboxylic Acid

摘要

Two coordination polymers, [Mn_2(btc)(phen)_4]_n?7nH_2O (1) and [Co_2(btc)(phen)(H_2O)_2]_n?nH_2O (2) (H_4btc = biphenyl-3,3',4,4'-tetracarboxylic acid, phen = 1,10-phenanthroline) were hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Compound 1 has a 1D chain structure in which the dinuclear Mn_2 units are linked through (btc)~(4-) ligands. Magnetic measurements revealed weak antiferromagnetic and ferromagnetic exchange coupling interactions between Mn~(II) and Co~(II) ions in 1 and 2, respectively. Moreover, both compounds have good thermal stabilities.