Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2·3H2O
Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2·3H2O (Arg=arginine). Magnetic susceptibility χ in the temperature range 2-160 K, and a magnetization isotherm at T=2.29(1) K with magnetic fields between 0 and 9 T were measured. The observed variation of χT with T indicates pr...
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2007
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| LEADER | 08808caa a22009977a 4500 | ||
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| 001 | PAPER-6476 | ||
| 003 | AR-BaUEN | ||
| 005 | 20241203084759.0 | ||
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| 024 | 7 | |2 scopus |a 2-s2.0-34447578879 | |
| 030 | |a JPCSA | ||
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Gerard, M.F. | |
| 245 | 1 | 0 | |a Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2·3H2O |
| 260 | |c 2007 | ||
| 270 | 1 | 0 | |m Calvo, R.; Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and INTEC (CONICET-UNL), Güemes 3450, 3000 Santa Fe, Argentina; email: calvo@fbcb.unl.edu.ar |
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| 506 | |2 openaire |e Política editorial | ||
| 520 | 3 | |a Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2·3H2O (Arg=arginine). Magnetic susceptibility χ in the temperature range 2-160 K, and a magnetization isotherm at T=2.29(1) K with magnetic fields between 0 and 9 T were measured. The observed variation of χT with T indicates predominant antiferromagnetic interactions between Cu(II) ions coupled in 1D chains along the b axis. Fitting a molecular field model to the susceptibility data allows to evaluate g=2.10(1) for the average g-factor and J=-0.42(6) cm-1 for the nearest neighbor exchange coupling (defined as Hex = - ∑ Jij Si · Sj). This coupling is assigned to syn-anti equatorial-apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682 Å, with a total bond length of 6.989 Å and is consistent with the magnetization isotherm results. It is discussed and compared with couplings observed in other compounds with similar exchange bridges. EPR spectra at 9.77 were obtained in powder samples and at 9.77 and at 34.1 GHz in the three orthogonal planes of single crystals. At both microwave frequencies, and for all magnetic field orientations a single signal arising from the collapse due to exchange interaction of resonances corresponding to two rotated Cu(II) sites is observed. From the EPR results the molecular g-tensors corresponding to the two copper sites in the unit cell were evaluated, allowing an estimated lower limit |J |>0.1 cm-1 for the exchange interaction between Cu(II) neighbors, consistent with the magnetic measurements. The observed angular variation of the line width is attributed to dipolar coupling between Cu(II) ions in the lattice. © 2007 Elsevier Ltd. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq | ||
| 536 | |a Detalles de la financiación: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior | ||
| 536 | |a Detalles de la financiación: Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, PICT 06−13782 | ||
| 536 | |a Detalles de la financiación: Universidad Nacional del Litoral, PIP 5274 | ||
| 536 | |a Detalles de la financiación: We thank to the Spanish Research Council (CSIC) for providing us with free-of-charge licenses to the Cambridge Structural Database [32,33] . The work in Argentina was supported by grants CAI+D−UNL, PIP 5274 and ANPCyT PICT 06−13782. The work in Brazil was supported by CNPq, FAPERJ and CAPES. MP and RC are members of CONICET. | ||
| 593 | |a Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and INTEC (CONICET-UNL), Güemes 3450, 3000 Santa Fe, Argentina | ||
| 593 | |a Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, CP 131, 74001-970 Goiânia, GO, Brazil | ||
| 593 | |a Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, INQUIMAE, Ciudad Universitaria, Pabellon II, 1428 Buenos Aires, Argentina | ||
| 593 | |a Instituto de Física, Universidade Federal do Rio de Janeiro, CP 68528, 21941-972 Rio de Janeiro, RJ, Brazil | ||
| 690 | 1 | 0 | |a D. ELECTRON PARAMAGNETIC RESONANCE |
| 690 | 1 | 0 | |a D. MAGNETIC PROPERTIES |
| 690 | 1 | 0 | |a ANTIFERROMAGNETIC INTERACTIONS |
| 690 | 1 | 0 | |a MAGNETIC MEASUREMENTS |
| 690 | 1 | 0 | |a MAGNETIZATION ISOTHERM |
| 690 | 1 | 0 | |a MOLECULAR FIELD MODEL |
| 690 | 1 | 0 | |a ANTIFERROMAGNETISM |
| 690 | 1 | 0 | |a MAGNETIC COUPLINGS |
| 690 | 1 | 0 | |a MAGNETIC FIELDS |
| 690 | 1 | 0 | |a MAGNETIZATION |
| 690 | 1 | 0 | |a PARAMAGNETIC RESONANCE |
| 690 | 1 | 0 | |a COPPER COMPOUNDS |
| 700 | 1 | |a Aiassa, C. | |
| 700 | 1 | |a Casado, Nieves María Claudia | |
| 700 | 1 | |a Santana, R.C. | |
| 700 | 1 | |a Perec, M. | |
| 700 | 1 | |a Rapp, R.E. | |
| 700 | 1 | |a Calvo, Rafael A. | |
| 773 | 0 | |d 2007 |g v. 68 |h pp. 1533-1539 |k n. 8 |p J Phys Chem Solids |x 00223697 |w (AR-BaUEN)CENRE-2180 |t Journal of Physics and Chemistry of Solids | |
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| 856 | 4 | 0 | |u https://doi.org/10.1016/j.jpcs.2007.03.032 |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_00223697_v68_n8_p1533_Gerard |y Handle |
| 856 | 4 | 0 | |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223697_v68_n8_p1533_Gerard |y Registro en la Biblioteca Digital |
| 961 | |a paper_00223697_v68_n8_p1533_Gerard |b paper |c PE | ||
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| 999 | |c 67429 | ||