Bis{bis(azido-kN)bis[bis(pyridin-2-yl-kN)amine]- cobalt(III)} sulfate dihydrate

Abstract

The search for new molecular materials with interesting magnetic properties, using the pseudohalide azide ion and di-2-pyridylamine (dpa, C10H9N3) as a chelating ligand, led to the synthesis and structure determination of the title compound, [Co(N3)2(dpa)2]2SO4-2H2O. The crystal structure comprises discrete [Co(dpa)2(N3)2]+ cations, sulfate anions, as well as H2O solvent molecules. The CoIII cations display a slightly distorted octahedral coordination sphere defined by two N atoms from azide anions and four N atoms from the pyridyl rings of two dpa ligands. In the crystal, extensive C-H ⋯ O, N-H ⋯ O, and O-H ⋯ O interactions result in supramolecular sheets that lie parallel to the ab plane. The sheets are further linked through O-H ⋯ N interactions between the water molecules of one sheet and azide anions of another sheet, forming a supramolecular framework.