Structure and magnetic properties of bis-o-benzosemiquinonato zinc complexes

New bis-o-benzosemiquinonato complexes of zinc based on sterically hindered 3,6-di-tert-butyl-o-benzoquinone were synthesized and investigated. The set of the magnetic susceptibilities measurements and quantum chemical calculations established that the weak intramolecular ferromagnetic interaction between o-semiquinone radicals is masked by the comparable in magnitude intermolecular antiferromagnetic exchange.165