Synthesis, Characterization, and Magnetic Studies of Coordination Polymers with Co(II) and Mn(II) Ions

Abstract

An ether bridged tricarboxylic acid ligand, 5-(4-carboxybenzyloxy)isophthalic acid (p-cbiaH3) has been used to construct three coordination polymers with Co(II) salts in presence of different nitrogen donor ligands such as 1,4-bis(4-pyridinylmethyl)piperazine (bpmp), dipyridine-4-yl-diazene (dpd), and 4,4′-bipyridine (bpy). The products formed under hydrothermal conditions are formulated as {[Co3(p-cbia)2(bpmp)2(H2O)6]·10H2O}n (1), {[Co2(p-cbiaH)2(dpd)(H2O)2]}n (2) and {[Co3(p-cbia)2(bpy)(H2O)8]·6H2O}n (3). Reacting with MnCl2·4H2O under solvothermal condition, it affords {[Mn3(p-cbia)2(DMF)2]·DMF}n (4). All the complexes have been characterized by single-crystal X-ray diffraction, IR spectroscopy, thermogravimetry, elemental analysis, and powder X-ray diffraction (PXRD) measurements. Topological analysis reveals that 1 is a (3,4)-connected jeb net, 2 is a (3,8)-connected tfz-d net, while 3 forms a 3-connected hcb type net. However, with the Mn(II) salt, it forms a 3D coordination polymer with a novel (5,...