Strong antiferromagnetic coupling of the cobalt(ii)–semiquinone radical in a dinuclear complex with 2,2′-bipyrimidine ligands

Abstract

In this study, a new dinuclear cobalt(II)–radical complex [Co₂(3,5-DBSQ)₄(bpym)]·(3,5-DBCatH₂)₄ (1) (3,5-DBSQ = 3,5-di-tert-butylsemiquinone, 3,5-DBCatH₂ = 3,5-di-tert-butylcatecholato, bpym = 2,2′-bipyrimidine) was synthesized and characterized using single-crystal X-ray crystallography. Simulated results indicated relatively strong antiferromagnetic exchange coupling between cobalt(II) centers and semiquinone radical ligands.