INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Synthesis, solid state structures and EPR studies in polycrystalline and single crystal samples of alpha-diimine cobalt(II) complexes
Autor/es:
VÍTOR ROSA; PABLO J. GONZALEZ; TERESA AVILÉS; PEDRO T. GOMES; RICHARD WELTER; ALBERTO C. RIZZI,; MARIO C. G. PASSEGGI; CARLOS D. BRONDINO
Revista:
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Editorial:
Wiley-VCH Verlag GmbH & Co.
Referencias:
Año: 2006 p. 4761 - 4769
ISSN:
1434-1948
Resumen:
Cobalt compounds of the general formula [CoX2(á-diimine)], where X = Cl or I and the á-diimines are 1,4-diaryl-2,3-dimethyl-1,4-diaza-1,3-butadiene (Ar-DAB) and bis(aryl)- acenaphthenequinonediimine (Ar-BIAN) were synthesizedby the direct reaction of the anhydrous cobalt salts CoCl2 or CoI2 and the corresponding á-diimine ligand in driedCH2Cl2. The synthesized compounds are [Co(Ph-DAB)Cl2] (1a), [Co(o,o,p-Me3C6H2-DAB)Cl2] (1b), and [Co(o,o-iPr2C6H3-DAB)Cl2] (1c) with the ligands Ar-DAB, and also[Co(o,o,p-Me3C6H2-BIAN)I2] (2b) with the ligand Ar-BIAN. The crystal structures of all the compounds were solved by single-crystal X-ray diffraction. In all cases the cobalt atom is in a distorted tetrahedron, which is built up of two halide atoms and two nitrogen atoms of the á-diimine ligand. X band EPR measurements of polycrystalline samples performed on compounds 1b, 1c, and 2b indicate a high-spin CoII ion (S = 3/2) in an axially distorted environment. Singlecrystal EPR experiments on compounds 1b and 1c allowed us to evaluate the orientation of the g tensor in the molecular frame.