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Abstract:

We report powder and single crystal EPR measurements of [Cu(tda)(phen)]2·H2tda (tda = thiodiacetate, phen = phenanthroline) at 9.7 GHz. This compound consists of centrosymmetric copper(II) ion dimers, weakly ferromagnetically exchange-coupled (J = +3.2 cm-1), in which the dimeric units are linked by hydrophobic chemical paths involving the phen molecules. EPR revealed that the triplet spectra are collapsed by interdimeric exchange interactions mediated by that chemical path. Analysis and simulation of the single crystal EPR spectra were performed using Anderson's exchange narrowing model, together with statistical arguments. This approach allowed us to interpret the spectra modulated by the interdimeric interactions in situations of weak, intermediate, and strong exchange. We evaluated an interdimeric exchange constant J′ = 0.0070(3) cm -1, indicating that hydrophobic paths can transmit weak exchange interactions between centers at relatively long distances of the order of ∼10 Å. © 2010 American Chemical Society.

Registro:

Documento: Artículo
Título:Single crystal EPR study of the dinuclear Cu(II) complex [Cu(tda)(phen)]2·H2tda (tda = Thiodiacetate, phen = Phenanthroline): Influence of weak interdimeric magnetic interactions
Autor:Neuman, N.I.; Perec, M.; González, P.J.; Passeggi, M.C.G.; Rizzi, A.C.; Brondino, C.D.
Filiación:Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Paraje El Pozo, S3000ZAA Santa Fe, Argentina
Departamento de Química Inorgánica Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina
Departamento da Quimica, Requimte/CQFB, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Intec, Conicet-UNL, Güemes 3450, 3000 Santa Fe, Argentina
Palabras clave:Analysis and simulation; Andersons; Centrosymmetric; Copper ions; Cu complexes; Dimeric units; Dinuclear; Exchange constants; Hydrophobic chemicals; Long distances; Magnetic interactions; Phenanthrolines; Single crystal EPR; Computer simulation; Dimers; Exchange interactions; Hydrophobicity; Ion exchange; Paramagnetic resonance; Single crystals; Electron spin resonance spectroscopy; copper; ligand; organometallic compound; article; chemical structure; chemistry; conformation; dimerization; electron spin resonance; magnetism; X ray crystallography; Copper; Crystallography, X-Ray; Dimerization; Electron Spin Resonance Spectroscopy; Ligands; Magnetics; Models, Molecular; Molecular Conformation; Organometallic Compounds
Año:2010
Volumen:114
Número:50
Página de inicio:13069
Página de fin:13075
DOI: http://dx.doi.org/10.1021/jp108736p
Título revista:Journal of Physical Chemistry A
Título revista abreviado:J Phys Chem A
ISSN:10895639
CODEN:JPCAF
CAS:copper, 15158-11-9, 7440-50-8; Copper, 7440-50-8; Ligands; Organometallic Compounds
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v114_n50_p13069_Neuman

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Citas:

---------- APA ----------
Neuman, N.I., Perec, M., González, P.J., Passeggi, M.C.G., Rizzi, A.C. & Brondino, C.D. (2010) . Single crystal EPR study of the dinuclear Cu(II) complex [Cu(tda)(phen)]2·H2tda (tda = Thiodiacetate, phen = Phenanthroline): Influence of weak interdimeric magnetic interactions. Journal of Physical Chemistry A, 114(50), 13069-13075.
http://dx.doi.org/10.1021/jp108736p
---------- CHICAGO ----------
Neuman, N.I., Perec, M., González, P.J., Passeggi, M.C.G., Rizzi, A.C., Brondino, C.D. "Single crystal EPR study of the dinuclear Cu(II) complex [Cu(tda)(phen)]2·H2tda (tda = Thiodiacetate, phen = Phenanthroline): Influence of weak interdimeric magnetic interactions" . Journal of Physical Chemistry A 114, no. 50 (2010) : 13069-13075.
http://dx.doi.org/10.1021/jp108736p
---------- MLA ----------
Neuman, N.I., Perec, M., González, P.J., Passeggi, M.C.G., Rizzi, A.C., Brondino, C.D. "Single crystal EPR study of the dinuclear Cu(II) complex [Cu(tda)(phen)]2·H2tda (tda = Thiodiacetate, phen = Phenanthroline): Influence of weak interdimeric magnetic interactions" . Journal of Physical Chemistry A, vol. 114, no. 50, 2010, pp. 13069-13075.
http://dx.doi.org/10.1021/jp108736p
---------- VANCOUVER ----------
Neuman, N.I., Perec, M., González, P.J., Passeggi, M.C.G., Rizzi, A.C., Brondino, C.D. Single crystal EPR study of the dinuclear Cu(II) complex [Cu(tda)(phen)]2·H2tda (tda = Thiodiacetate, phen = Phenanthroline): Influence of weak interdimeric magnetic interactions. J Phys Chem A. 2010;114(50):13069-13075.
http://dx.doi.org/10.1021/jp108736p