Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2·3H2O

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dc.creatorGerard, M. F.
dc.creatorAiassa, C.
dc.creatorCasado, N. M. C.
dc.creatorSantana, Ricardo Costa de
dc.creatorPerec, Mireille
dc.creatorRapp, Raul Edgardo
dc.creatorCalvo, Rafael
dc.date.accessioned2024-07-11T15:21:53Z
dc.date.available2024-07-11T15:21:53Z
dc.date.issued2007
dc.description.abstractMagnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2 3H2O (Arg ¼ arginine). Magnetic susceptibility w in the temperature range 2–160 K, and a magnetization isotherm at T ¼ 2.29(1) K with magnetic fields between 0 and 9 T were measured. The observed variation of wT 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 ¼ 2.10(1) for the average g-factor and J ¼ 0.42(6) cm1 for the nearest neighbor exchange coupling (defined as Hex ¼ PJijSi Sj). This coupling is assigned to syn–anti equatorial–apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682 A˚ , with a total bond length of 6.989 A˚ 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 |40.1 cm1 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. r 2007 Elsevier Ltd. All rights reserved.
dc.identifier.citationGERARD, M. F.; AIASSA, C.; CASADO, N. M. C.; SANTANA, R. C.; PEREC, M.; RAPP, R. E.; CALVO, R. Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2 .3H2O. Journal of Physics and Chemistry of Solids, Amsterdam, v. 68, n. 8, p. 1533-1539, 2007. DOI: 10.1016/j.jpcs.2007.03.032 . Disponível em: https://www.sciencedirect.com/science/article/pii/S0022369707001564. Acesso em: 28 maio 2023.
dc.identifier.doi10.1016/j.jpcs.2007.03.032
dc.identifier.issn0022-3697
dc.identifier.issne- 1879-2553
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022369707001564
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectD. Magnetic properties
dc.subjectD. Electron paramagnetic resonance
dc.titleMagnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2·3H2O
dc.typeArtigo

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