title: Ferromagnetic Coupling in the Heterospin Bis-Catecholato-Manganese(IV) Complex with Pyridine Substituted by Nitronyl-nitroxide.
abstract: A new bis(3,6-di-tert-butyl-catecholato)manganese complex with two 4-NIT-Py ligands was synthesized and characterized [4-NIT-Py = pyridine substituted at position 4 with nitronyl-nitroxide radical, 2-(pyridin-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl]. X-ray diffraction indicated an octahedral environment of the manganese atom with a trans arrangement of ligands. Bonds lengths in the inner coordination core of the metal and in the chelate cycles that are representative of the charge distribution between the metal and ligands displayed a Mn(IV)(Cat2-)2charge distribution. Variable-temperature magnetic susceptibility measurements detected intramolecular ferromagnetic coupling between the Mn(IV) S =3/2spins and spins of nitronyl-nitroxyls and intermolecular ferromagnetic interactions of spins of adjacent nitronyl-nitroxide fragments in a chain of molecules at low temperatures. The last phenomenon is revealed by short contacts between nitronyl-nitroxide radicals of adjacent complex molecules.
authors.affiliation: G. A. Razuvaev Institute of organometallic chemistry of RAS , 49 Tropinina str., 603950 Nizhniy, Novgorod, Russia.
authors.forename: Michael P
authors.identifier: http://orcid.org/0000-0002-0536-3711
authors.initials: MP
authors.lastname: Bubnov
authors.affiliation: G. A. Razuvaev Institute of organometallic chemistry of RAS , 49 Tropinina str., 603950 Nizhniy, Novgorod, Russia.
authors.forename: Irina A
authors.initials: IA
authors.lastname: Teplova
authors.affiliation: G. A. Razuvaev Institute of organometallic chemistry of RAS , 49 Tropinina str., 603950 Nizhniy, Novgorod, Russia.
authors.forename: Eugenia A
authors.initials: EA
authors.lastname: Kopylova
authors.affiliation: G. A. Razuvaev Institute of organometallic chemistry of RAS , 49 Tropinina str., 603950 Nizhniy, Novgorod, Russia.
authors.forename: Konstantin A
authors.initials: KA
authors.lastname: Kozhanov
authors.affiliation: International Tomography Center of Siberian Branch of RAS , 3a Institutskaya str., Novosibirsk 630090, Russia.
authors.forename: Artem S
authors.identifier: http://orcid.org/0000-0002-6918-5459
authors.initials: AS
authors.lastname: Bogomyakov
authors.affiliation: International Tomography Center of Siberian Branch of RAS , 3a Institutskaya str., Novosibirsk 630090, Russia.
authors.forename: Marina V
authors.initials: MV
authors.lastname: Petrova
authors.affiliation: International Tomography Center of Siberian Branch of RAS , 3a Institutskaya str., Novosibirsk 630090, Russia.
authors.forename: Vitaly A
authors.initials: VA
authors.lastname: Morozov
authors.affiliation: International Tomography Center of Siberian Branch of RAS , 3a Institutskaya str., Novosibirsk 630090, Russia.
authors.forename: Victor I
authors.initials: VI
authors.lastname: Ovcharenko
authors.affiliation: G. A. Razuvaev Institute of organometallic chemistry of RAS , 49 Tropinina str., 603950 Nizhniy, Novgorod, Russia.
authors.forename: Vladimir K
authors.initials: VK
authors.lastname: Cherkasov