The diversities of magnetic behaviors appearing simultaneously in three isomorphs based on 1H-tetrazolyl-acetic acid ligand

Abstract

Three isomorphous metal–organic complexes with 1H-tetrazolyl-acetic acid (TAA), namely [M(TAA)₂]_n (M = Mn^II, 1, Co^II, 2 and Ni^II, 3), have been synthesized under hydrothermal conditions. All the compounds were fully characterized by X-ray crystallography, elemental analysis, IR spectroscopy, thermal analysis and magnetic studies. The single crystal X-ray analyses show that the 1D chains of [M(COO⁻)₂]_n (M = Mn^II, 1, Co^II, 2 and Ni^II, 3) are further joined by tetrazolyl spacers to form a 3D network. Based on the topological perspective, the complexes can be simplified into a (3,6)-connected 2-nodal net with (4².6)₂(4⁴.6².8⁸.10) “ant” topology. The magnetic measurements reveal different magnetic exchange-coupling interactions: antiferromagnetic for 1 and ferromagnetic for 2 and 3. Furthermore, the magnetic measurements confirm that spin glass behaviour occurs in 3 but not in 2.