INQUIMAE 12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Antiferromagnetic interactions between neighboring Fe(III) centers through chemical paths involving H-Bonds
Autor/es:
R. BAGGIO; L.D. SLEP; R. CALVO; O. PEÑA; M. PEREC
Lugar:
Puerto Madryn- Chubut
Reunión:
Workshop; Segunda Reunión de la Asociación Argentina de Cristalografía; 2006
Institución organizadora:
Universidad Nacional de la Patagonia, CENPAT
Resumen:
ANTIFERROMAGNETIC INTERACTIONS BETWEEN NEIGHBORING FE (III) CENTERS THROUGH CHEMICAL PATHS INVOLVING H-BONDS
A seven-coordinate FeIII complex, [Fe(oda)(H2O)2(NO3)], was obtained after dissolving Fe(NO3)3.9H2O in an aqueous solution of oxydiacetic acid (H2oda) at room temperature. In the solid state, the FeIII center adopts a pentagonal bipyramid geometry with an {FeO7} core formed by a tridentate oda2- and a bidentate NO3- in the equatorial plane, and two axial water molecules. Magnetic measurements and EPR spectra revealed the presence of S = 5/2 FeIII centers with rhombic zero field splitting parameters (D = 0.81 cm-1, E/D = 0.33 ). Weak antiferromagnetic interactions with J » -0.06 cm-1 operating between neighboring Fe ions connected through Fe-O-C-O
H-O-Fe paths are estimated using the molecular field approximation.
Keywords: FeIII/ Oxydiacetato/ Structure/ Magnetic properties/ EPR
Ricardo Baggioa ,Leonardo Slepb Rafael Calvoc, Octavio Peñad, Mireille Perecb
