Structural and magnetic characterization of one-dimensional oxalato-bridged metal(II) complexes with 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole ligand: A supramolecular open-framework

A new family of one-dimensional oxalato-bridged metal(II) complexes with formula {[M(ox)(abpt)]·4H2O}n [MII = Mn (1), Fe (2), Co (3), Zn (4); ox = oxalate dianion; abpt = 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole] has been synthesized and chemically, structurally and magnetically characterized. The crystal structures of compounds 2–4 have been solved by single crystal X-ray diffraction, whereas complex 1 has been studied by means of X-ray powder diffraction methods. All of them are isomorphous and crystallize in the triclinic space group P  1¯. The metal atoms are bridged by bis-bidentate oxalate anions forming zig-zag chains in which bidentate chelating abpt ligands complete the octahedral O4N2 donor set. The crystal structures show an open-framework that contains rectangular channels in which easily removable hydrogen bonded ribbons of water molecules are located. The occurrence of antiferromagnetic intrachain interactions for compounds 1–3 was determined by cryomagnetic susceptibility measurements.

Graphical abstractThe crystal structure and magnetic properties of the one-dimensional oxalato-bridged metal(II) complexes {[M(μ-ox)(abpt)]·4H2O}n [MII = Mn, Fe, Co, Zn; abpt = 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole] are reported. The packing of these chains gives rise to an open-framework that contains rectangular channels in which easily removable hydrogen bonded ribbons of water molecules are located.Figure optionsDownload full-size imageDownload as PowerPoint slide