CONTRATADOS
CALVO Rafael
artículos
Título:
Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
Autor/es:
SARTORIS, ROSANA P; CALVO, RAFAEL; SANTANA, RICARDO; NASCIMENTO, OTACIRO R; PEREC, MIREILLE; BAGGIO, RICARDO
Revista:
POLYHEDRON
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 79 p. 178 - 178
ISSN:
0277-5387
Resumen:
Two new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]2 1 and  [Cu2(terpy)2(HO7P2).(H2O4 P).(H3O4 P).(H2 O)] 2 (dpa = 2,2´-dipyridylamine and terpy = 2,2´:6´,2"-terpyridine) were isolated and their crystal structures determined by single- crystal X-ray diffraction. The compounds are triclinic and contain dinuclear copperII units bridged by pyrophosphate anions. Their EPR spectra observed in single crystal samples as a function of field orientation at 293 K display a single resonance, as in mononuclear spin systems, without hyperfine structure and their g-factors and line widths were measured. The relations between the principal directions of the g-matrices and the molecular structures are discussed and compared with related compounds. The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions