%0 Journal Article %A Lama, Prem %A Aijaz, Arshad %A Sañudo, E. Carolina %A Bharadwaj, Parimal K. %D 2010 %T Synthesis, Structure, and Magnetic Properties of Cobalt(II) Coordination Polymers from a New Tripodal Carboxylate Ligand: Weak Ferromagnetism and Metamagnetism %U https://acs.figshare.com/articles/journal_contribution/Synthesis_Structure_and_Magnetic_Properties_of_Cobalt_II_Coordination_Polymers_from_a_New_Tripodal_Carboxylate_Ligand_Weak_Ferromagnetism_and_Metamagnetism/2801722 %R 10.1021/cg900896w.s001 %2 https://acs.figshare.com/ndownloader/files/4496131 %K tripodal carboxylic ligand %K core %K New Tripodal Carboxylate Ligand %K Co %K coordination polymers %K IR %X A new tripodal carboxylic ligand, 5-(4-carboxy-phenoxy)-isophthalic acid, readily (cpiaH3) reacts with Co(II) salts in the presence of pyridine-based coligands under solvothermal conditions to afford four different coordination polymers, {Co2(cpia)(OH)(bipy)0.5}n (1), {[Co2(cpia)(OH)(H2O)2]·H2O}n (2), {Co1.5(cpia)(bipyethane)}n (3), and {Co1.5(cpia)(pyridine)2}n (4). All these coordination polymers have been characterized by single crystal X-ray diffraction, IR spectroscopy, thermogravimetry and elemental analysis. The structures of 1 and 2 can be described as a repetition of a tetranuclear core with subtle differences  two tetranuclear cores are shared by an O atom in 2, while no such bridging is present in 1. The structures of 3 and 4, on the other hand, consist of a trinuclear core extending to three-dimensional networks. Variable temperature magnetic susceptibility measurements indicate that 1 exhibits ferromagnetic behavior below 13 K, while 2 shows metamagnetic behavior. These interesting magnetic features are associated with the mixed hydroxyl/carboxylate-bridged polynuclear Co(II) clusters as subunits. %I ACS Publications