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Abstract:

A binuclear Cu II compound [Cu 2 (bpa) 2 (P 2 O 7 )(H 2 O) 2 ]·2.5H 2 O, 1, (bpa = 2,2′-bipyridylamine), with pairs of Cu II ions bridged by one pyrophosphate tetra-anion, was synthesized and crystallized. Its triclinic structure was determined by single-crystal X-ray diffraction. Electron paramagnetic resonance (EPR) spectra of single crystal samples of 1 were recorded for a fixed orientation of the magnetic field (B 0 ) as a function of temperature (T) between 4.7 and 293 K, and at T = 4.7, 50 and 293 K, as a function of the orientation of B 0 . Below ∼8 K, the spectra are assigned to two types of mononuclear crystal defects hyperfine-coupled to one copper and two nitrogen nuclei. The g-matrices and hyperfine couplings at these T provide information about the structures of these defects. Above 10 K, the spectrum is dominated by the response of the bulk binuclear Cu II material, showing hyperfine interactions with two copper nuclei, collapsing to a single peak above 18 K when the units are magnetically connected, and the magnetic behaviour becomes 3D. We attribute the results above 10 K to the interplay of an AFM intrabinuclear exchange interaction J 0 = -28(3) cm -1 (defined as ex = -J 0 S 1 ·S 2 ), and three orders of magnitude weaker exchange coupling with average magnitude J 1 ≥ 0.022 cm -1 between Cu II ions in neighbouring binuclear units. The interplays between structure, exchange couplings, magnetic dimension and spin dynamics in the binuclear compound are discussed. A previously unreported situation, where the structure of the spectra arising from the anisotropic spin-spin interaction term (D) within the binuclear unit is averaged out, but the forbidden half field transition is not, is observed and explained. This journal is © The Royal Society of Chemistry 2015.

Registro:

Documento: Artículo
Título:Structure and magnetism of a binuclear Cu II pyrophosphate: Transition to a 3D magnetic behaviour studied by single crystal EPR
Autor:Sartoris, R.P.; Nascimento, O.R.; Santana, R.C.; Perec, M.; Baggio, R.F.; Calvo, R.
Filiación:Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional Del Litoral, Ciudad Universitaria, Santa Fe, 3000, Argentina
Grupo de Biofísica Molecular Sergio Mascarenhas, Departamento de Física e Ciência Interdisciplinar, Universidade de São Paulo, CP 369, São Carlos SP, 13560-970, Brazil
Instituto de Física, Universidade Federal de Goiás Campus Samambaia, CP 131, Goiânia GO, 74001-970, Brazil
Facultad de Ciencias Exactas y Naturales, INQUIMAE-DQIAQF, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Comisión Nacional de Energía Atómica, Av. General Paz 1499, San Martín Buenos Aires, 1650, Argentina
Instituto de Física Del Litoral (CONICET-UNL), Güemes 3450, Santa Fe, 3000, Argentina
Palabras clave:Copper; Copper compounds; Couplings; Crystal defects; Crystal orientation; Crystal structure; Defects; Exchange coupling; Ions; Magnetic couplings; Magnetic resonance; Magnetism; Paramagnetic resonance; Single crystals; Spin dynamics; X ray diffraction; Binuclear compounds; Electron paramagnetic resonances (EPR); Hyperfine interactions; Single crystal samples; Single crystal x-ray diffraction; Spin-spin interaction; Three orders of magnitude; Triclinic structures; Electron spin resonance spectroscopy; copper; diphosphoric acid; pyrophosphoric acid derivative; chemical structure; chemistry; electron spin resonance; magnetism; X ray crystallography; Copper; Crystallography, X-Ray; Diphosphates; Electron Spin Resonance Spectroscopy; Magnetic Phenomena; Models, Molecular
Año:2015
Volumen:44
Número:10
Página de inicio:4732
Página de fin:4743
DOI: http://dx.doi.org/10.1039/c4dt03616f
Título revista:Dalton Transactions
Título revista abreviado:Dalton Trans.
ISSN:14779226
CODEN:DTARA
CAS:copper, 15158-11-9, 7440-50-8; Copper; Diphosphates; diphosphoric acid
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14779226_v44_n10_p4732_Sartoris

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Citas:

---------- APA ----------
Sartoris, R.P., Nascimento, O.R., Santana, R.C., Perec, M., Baggio, R.F. & Calvo, R. (2015) . Structure and magnetism of a binuclear Cu II pyrophosphate: Transition to a 3D magnetic behaviour studied by single crystal EPR. Dalton Transactions, 44(10), 4732-4743.
http://dx.doi.org/10.1039/c4dt03616f
---------- CHICAGO ----------
Sartoris, R.P., Nascimento, O.R., Santana, R.C., Perec, M., Baggio, R.F., Calvo, R. "Structure and magnetism of a binuclear Cu II pyrophosphate: Transition to a 3D magnetic behaviour studied by single crystal EPR" . Dalton Transactions 44, no. 10 (2015) : 4732-4743.
http://dx.doi.org/10.1039/c4dt03616f
---------- MLA ----------
Sartoris, R.P., Nascimento, O.R., Santana, R.C., Perec, M., Baggio, R.F., Calvo, R. "Structure and magnetism of a binuclear Cu II pyrophosphate: Transition to a 3D magnetic behaviour studied by single crystal EPR" . Dalton Transactions, vol. 44, no. 10, 2015, pp. 4732-4743.
http://dx.doi.org/10.1039/c4dt03616f
---------- VANCOUVER ----------
Sartoris, R.P., Nascimento, O.R., Santana, R.C., Perec, M., Baggio, R.F., Calvo, R. Structure and magnetism of a binuclear Cu II pyrophosphate: Transition to a 3D magnetic behaviour studied by single crystal EPR. Dalton Trans. 2015;44(10):4732-4743.
http://dx.doi.org/10.1039/c4dt03616f