Magnetic properties of a cobalt(II) dimer of pseudo tetrahedral geometry [Co-2{(CO)(9)Co3C-COO}(5), C14H19N2H]

Calvo-Perez, V; Spodine, E.

Abstract

The crystalline ion pair [Co-2{OOC-CCo3(CO)(9)}(5), C10H6(N(CH3)(2))(2)H] (1) presents unusual magnetic properties. The X-band EPR spectrum of 1 at room temperature presents two unresolved bands at g = 1.98 and 4.55. At a low temperature (20 K), the cluster of clusters 1 presents a complicated spectrum with an intense signal at 1700 G. The magnetic susceptibility of 1 was fit to a two spin S-1 = S-2 = 3/2 Heisenberg model, with J = 11.2 cm(-1) and a g value of 2.3. There is no field dependence of the magnetization, which suggests intramolecular coupling between the two tetrahedral centers of the cluster. Molecular orbital modeling indicates a sigma path of exchange between two topologically non-equivalent cobalt(II) centers. (C) 2000 Elsevier Science B.V. All rights reserved.

Más información

Título según WOS: Magnetic properties of a cobalt(II) dimer of pseudo tetrahedral geometry [Co-2{(CO)(9)Co3C-COO}(5), C14H19N2H]
Título según SCOPUS: Magnetic properties of a cobalt(II) dimer of pseudo tetrahedral geometry [Co2{(CO)9Co3C-COO}5, C14H19N2H]
Título de la Revista: INORGANICA CHIMICA ACTA
Volumen: 310
Número: 2
Editorial: ELSEVIER SCIENCE SA
Fecha de publicación: 2000
Página de inicio: 133
Página final: 139
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0020169300002504
DOI:

10.1016/S0020-1693(00)00250-4

Notas: ISI, SCOPUS