Structural and magnetic properties of 1D coordination polymers constructed by isophthalate and 2,4′-bipyridine

Abstract

Three new complexes {[Cu(ip)(2,4′-bpy) 2] · H 2O} n ( 1), {[Co(ip)(2,4′-bpy) 2] · H 2O} n ( 2) and [Ni(ip)(2,4′-bpy) 2(H 2O)] n ( 3) were prepared in the reaction of isophthalic acid (H 2ip) with different metal ions such as Cu II, Co II, and Ni II under hydrothermal conditions in the presence of 2,4′-bipyridine (2,4′-bpy) ligand. The metal ions are bridged by ip 2− anions to form 1D ribbon with 8-membered and 16-membered ring in complexes 1 and 2, while nickel ions are bridged by ip 2− anions and water molecules forming 1D ribbon with 8-membered and 20-membered ring in complex 3. It was found that antiferromagnetic interactions between metal ions can be tuned by the nature of metal center and/or the coordinated water molecule.