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Calvo, R.; Rapp, R.E.; Chagas, E.; Sartoris, R.P.; Baggio, R.; Garland, M.T.; Perec, M. "1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages" (2008) Inorganic Chemistry. 47(22):10389-10397
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Abstract:

Three isostructural Cu2Ln2 1-D polymers [Cu 2Ln2L10(H2O)4· 3H2O]n where Ln = Gd (1), Er (2), and Y (3) and HL= trans-2-butenoic acid, were synthesized and characterized by X-ray crystallography, electron paramagnetic resonance, and magnetic measurements. Pairs of alternate Cu2 and Ln2 dinuclear units are combined into a linear array by a set of one covalent η2: η1:μ2 carboxylate oxygen and two H bonds, at Cu⋯Ln distances of ca. 4.5 Å. These units exhibit four η1:η1:μ2 two η2: η1:μ2 carboxylate bridges, respectively. Magnetic measurements between 2 and 300 K, fields B0 = μ0H between 0 and 9 T, and electron paramagnetic resonance (EPR) measurements at the X-band and room temperature are reported. The magnetic susceptibilities indicate bulk antiferromagnetic behavior of the three compounds at low temperatures. Magnetization and EPR data for 1 and 3 allowed evaluation of the exchange couplings between both Cu and Gd ions in their dinuclear units and between Cu and Gd neighbor ions in the spin chains. The data for the isolated Cu2 units in 3 yield gII = 2.350 and g⊥ = 2.054, JCu-Cu = -338 (3) cm-1 for the exchange coupling [Hex(1,2) = -J1-2 S1·S2], and D0 = -0.342 (0.003) cm-1 and E0 = 0.003 (0.001) cm-1 for the zero-field-splitting parameters of the triplet state arising from anisotropic spin-spin interactions. Considering tetranuclear blocks Gd-Cu-Cu-Gd in 1, with the parameters for the Cu2 unit obtained for 3, we evaluated ferromagnetic interactions between Cu and Gd neighbors, JCu-Gd = 13.0 (0.1) cm-1, and between Gd ions in the Gd2 units, JGd-Gd = 0.25 (0.02) cm-1, with gGd = 1.991. The bulk antiferromagnetic behavior of 1 is a consequence of the antiferromagnetic coupling between Cu ions and of the magnitude, |JCu-Gd|, of the Cu-Gd exchange coupling. Compound 2 displays a susceptibility peak at 15 K that may be interpreted as the combined result from antiferromagnetic couplings between ErIII ions in Er 2 units and their coupling with the Cu2 units. © 2008 American Chemical Society.

Registro:

Documento: Artículo
Título:1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages
Autor:Calvo, R.; Rapp, R.E.; Chagas, E.; Sartoris, R.P.; Baggio, R.; Garland, M.T.; Perec, M.
Filiación:Facultad de Bioquímica Y Ciencias Biológicas, Universidad Nacional del Litoral, INTEC (CONICET-UNL), Güemes 3450, 3000 Santa Fe, Argentina
Universidade Federal do Rio de Janeiro, CP 68528, Rio de Janeiro 21941-972, RJ, Brazil
Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Buenos Aires, Argentina
Facultad de Ciencias Físicas Y Matemáticas, Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile
INQUIMAE-DQIAQF, Facultad de Ciencias Exactas Y Naturales, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina
Palabras clave:copper; crotonic acid derivative; lanthanide; ligand; organometallic compound; polymer; article; chemical model; chemical structure; chemistry; electron spin resonance; hydrogen bond; magnetism; X ray crystallography; Copper; Crotonic Acids; Crystallography, X-Ray; Electron Spin Resonance Spectroscopy; Hydrogen Bonding; Lanthanoid Series Elements; Ligands; Magnetics; Models, Chemical; Models, Molecular; Organometallic Compounds; Polymers
Año:2008
Volumen:47
Número:22
Página de inicio:10389
Página de fin:10397
DOI: http://dx.doi.org/10.1021/ic8014089
Título revista:Inorganic Chemistry
Título revista abreviado:Inorg. Chem.
ISSN:00201669
CODEN:INOCA
CAS:copper, 15158-11-9, 7440-50-8; Copper, 7440-50-8; Crotonic Acids; Lanthanoid Series Elements; Ligands; Organometallic Compounds; Polymers
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v47_n22_p10389_Calvo

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Citas:

---------- APA ----------
Calvo, R., Rapp, R.E., Chagas, E., Sartoris, R.P., Baggio, R., Garland, M.T. & Perec, M. (2008) . 1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages. Inorganic Chemistry, 47(22), 10389-10397.
http://dx.doi.org/10.1021/ic8014089
---------- CHICAGO ----------
Calvo, R., Rapp, R.E., Chagas, E., Sartoris, R.P., Baggio, R., Garland, M.T., et al. "1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages" . Inorganic Chemistry 47, no. 22 (2008) : 10389-10397.
http://dx.doi.org/10.1021/ic8014089
---------- MLA ----------
Calvo, R., Rapp, R.E., Chagas, E., Sartoris, R.P., Baggio, R., Garland, M.T., et al. "1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages" . Inorganic Chemistry, vol. 47, no. 22, 2008, pp. 10389-10397.
http://dx.doi.org/10.1021/ic8014089
---------- VANCOUVER ----------
Calvo, R., Rapp, R.E., Chagas, E., Sartoris, R.P., Baggio, R., Garland, M.T., et al. 1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages. Inorg. Chem. 2008;47(22):10389-10397.
http://dx.doi.org/10.1021/ic8014089