title: Heteroligand o-Semiquinonato-Formazanato Cobalt Complexes.
abstract: Two novel heteroligand o-semiquinonato-formazanato cobalt complexes [Co(3,6-SQ)(Form)] (1) and [Co(3,6-SQ)2(Form)] (2) (3,6-SQ is 3,6-di-tert-butyl-o-benzosemiquinonate radical anion; Form is 1,3,5-triphenylformazanate anion) were synthesized and characterized in detail. The molecular structures of [Co(3,6-SQ)(Form)] and [Co(3,6-SQ)2(Form)] were determined by X-ray analysis. Magnetic susceptibility measurements and spectroscopic studies have shown that square-planar complex 1 is diamagnetic with a residual paramagnetism due to antiferromagnetic exchange metal-ligand. Complex 2 includes cobalt(III) in the low-spin state and two anionic-radical o-semiquinonato and one formazanate ligand.
authors.affiliation: †G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Street, 603137 Nizhny Novgorod, Russia.
authors.forename: Natalia A
authors.initials: NA
authors.lastname: Protasenko
authors.affiliation: †G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Street, 603137 Nizhny Novgorod, Russia.
authors.forename: Andrey I
authors.initials: AI
authors.lastname: Poddel'sky
authors.affiliation: ‡International Tomography Center, Siberian Branch, Russian Academy of Sciences, Institutskaya Street 3a, 630090 Novosibirsk, Russia.
authors.forename: Artem S
authors.initials: AS
authors.lastname: Bogomyakov
authors.affiliation: †G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Street, 603137 Nizhny Novgorod, Russia.
authors.forename: Georgy K
authors.initials: GK
authors.lastname: Fukin
authors.affiliation: †G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Street, 603137 Nizhny Novgorod, Russia.
authors.forename: Vladimir K
authors.initials: VK
authors.lastname: Cherkasov