Weak Ferromagnetism Caused by a 2D Effect in Two New Cobalt(II)– and Nickel(II)–1,2‐Bis(4‐pyridyl)ethane (bpa) Polynuclear Compounds

Abstract

AbstractThe combination of bpa [1,2‐bis(4‐pyridyl)ethane] with the pseudohalide cyanato (NCO–) ligand leads to the preparation of two new isomorphous compounds exhibiting the general formula [M(NCO)2(bpa)2]n [M = Co (1) and M = Ni (2)]. Both compounds consist of M–(gauche‐bpa)2–M chains linked by hydrogen bonds to give a global 2D network. CoII and NiII ions are octahedrally coordinated to four bpa ligands and two terminal NCO groups. The two compounds exhibit slight antiferromagnetic interactions through bpa groups and a 2D effect leading to a ferromagnetic component.