Hydrothermal synthesis, structure and magnetic properties of a three-dimensional cobalt(II) – aminophenyltetrazolate coordination polymer

摘要

The hydrothermal reaction of cobalt(II) acetate tetrahydrate, 4-aminophenyl tetrazole and water at 135 ℃ for 48 hours provided orange crystals of [Co_3(OH)_2(H_2O)_2(aptet)_4] (1) (aptet = 4-aminophenyltetrazolate). The three-dimensional structure of compound 1 is constructed from chains of corner- and edge-sharing Co(II) octahedra linked into a framework through the dipodal ligand tethers. The cobalt sites of the chain are linked through tetrazolate groups in the N2,N3-bridging mode, as well as through μ_3-hydroxyl groups into trinuclear Co_3 substructures. The magnetic properties are consistent with a ferrimagnetic chain with the non-compensating resultant moment of one Co(II) per trinuclear Co(II) subunit. The temperature dependence of the ac magnetic susceptibility indicates glassy-like magnetic behavior.