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Abstract:

Two new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]2 1 and [Cu 2(terpy)2(HO7P2)·(H 2O4P)·(H3O4P)·(H 2O)] 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. The EPR spectra observed in three planes of single crystal samples as a function of field orientation at 293 K for compounds 1 and 2, and also for two other pyrophosphate compounds already reported, [Cu(bipy)(cis-H2O7P2)]2· 3(H2O) 3 and [Cu(bipy)(trans-H2P2O 7)]2 4 display a single resonance for any field orientation and temperatures T between 4 and 293 K, 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 temperature dependences of the intensity of the EPR signals observed for 1-4 above 4 K indicate a paramagnetic Curie behavior, with no indication of intradinuclear exchange interactions (so, |J| < 2 K). The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions, allowing to set a lower limit of their magnitudes. © 2014 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Structural and EPR studies of pyrophosphate-bridged dinuclear Cu II complexes
Autor:Sartoris, R.P.; Calvo, R.; Santana, R.C.; Nascimento, O.R.; Perec, M.; Baggio, R.F.
Filiación:Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional Del Litoral, Instituto de Física Del Litoral (CONICET-UNL), Güemes 3450, 3000 Santa Fe, Argentina
Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, CP 131, 74001-970 Goiânia, Brazil
Grupo de Biofísica Molecular Sergio Mascarenhas, Departamento de Física e Informática, Universidade de São Paulo, CP 369, 13560-970 São Carlos-SP, Brazil
Facultad de Ciencias Exactas y Naturales, DQIAQF-INQUIMAE, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Comisión Nacional de Energía Atómica, Av. Gral Paz 1499, 1650 San-Martín, Buenos Aires, Argentina
Palabras clave:Copper; EPR; Magnetic interactions; Pyrophosphates; Structure
Año:2014
Volumen:79
Página de inicio:178
Página de fin:185
DOI: http://dx.doi.org/10.1016/j.poly.2014.05.002
Título revista:Polyhedron
Título revista abreviado:Polyhedron
ISSN:02775387
CODEN:PLYHD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02775387_v79_n_p178_Sartoris

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Citas:

---------- APA ----------
Sartoris, R.P., Calvo, R., Santana, R.C., Nascimento, O.R., Perec, M. & Baggio, R.F. (2014) . Structural and EPR studies of pyrophosphate-bridged dinuclear Cu II complexes. Polyhedron, 79, 178-185.
http://dx.doi.org/10.1016/j.poly.2014.05.002
---------- CHICAGO ----------
Sartoris, R.P., Calvo, R., Santana, R.C., Nascimento, O.R., Perec, M., Baggio, R.F. "Structural and EPR studies of pyrophosphate-bridged dinuclear Cu II complexes" . Polyhedron 79 (2014) : 178-185.
http://dx.doi.org/10.1016/j.poly.2014.05.002
---------- MLA ----------
Sartoris, R.P., Calvo, R., Santana, R.C., Nascimento, O.R., Perec, M., Baggio, R.F. "Structural and EPR studies of pyrophosphate-bridged dinuclear Cu II complexes" . Polyhedron, vol. 79, 2014, pp. 178-185.
http://dx.doi.org/10.1016/j.poly.2014.05.002
---------- VANCOUVER ----------
Sartoris, R.P., Calvo, R., Santana, R.C., Nascimento, O.R., Perec, M., Baggio, R.F. Structural and EPR studies of pyrophosphate-bridged dinuclear Cu II complexes. Polyhedron. 2014;79:178-185.
http://dx.doi.org/10.1016/j.poly.2014.05.002