EPR study of Cu(II) dopant ions in single crystals of bis(l-asparaginato)Zn(II)

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dc.creatorSantana, Ricardo Costa de
dc.creatorSantos, Marcilene Gomes dos
dc.creatorCunha, R. O.
dc.creatorFerreira, Katiúscia Daiane
dc.creatorCarvalho, Jesiel Freitas
dc.creatorCalvo, Rafael
dc.creatorPeña Garcia, Ramón Raudel
dc.date.accessioned2024-07-11T15:25:38Z
dc.date.available2024-07-11T15:25:38Z
dc.date.issued2006
dc.description.abstractWe report an electron paramagnetic resonance (EPR) study at 33.9 GHz and room temperature of oriented single crystal samples of bis(l-asparaginato)Zn(II) doped with Cu(II). The variation of the spectra with magnetic field orientation was measured in three crystal planes (a*b, bc and a*c, with a*=b×c). These spectra display two groups of four peaks arising from the hyperfine interaction with the ICu=3/2 nuclear spins of copper. They were assigned to Cu(II) ions in two lattice sites related by a 180° rotation around the b-crystal axis. The g and hyperfine coupling (A) tensors of the Cu(II) ions were evaluated from the single crystal data. Some indeterminacy in the assignment of the signals was avoided measuring the EPR spectrum of a powder sample. Their principal values are g1=2.060(1), g2=2.068(2), g3=2.283(2), and A1≈0.1×10−4, A2=13×10−4 and A3=165×10−4 cm−1. The eigenvectors corresponding to g3 and A3 are coincident within the experimental error; the other eigenvectors are rotated 5.6° in the perpendicular plane. Considering the crystal structure of bis(l-asparaginato)Zn(II), our EPR results indicate that the Cu(II) impurities replace Zn(II) ions in the host crystal. We propose a molecular model based on the EPR data and the structural information, and analyse the results comparing the measured values with those obtained in similar systems.
dc.identifier.citationSANTANA, R. C. ; SANTOS, M. G.; CUNHA, R. O.; FERREIRA, K. D.; CARVALHO, J. F.; CALVO, R. EPR study of Cu(II) dopant ions in single crystals of bis(l-asparaginato)Zn(II). Journal of Physics and Chemistry of Solids, Amsterdam, v. 67, n.4, p. 745-750, 2006. DOI: 10.1016/j.jpcs.2005.11.006. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022369705006335. Acesso em: 26 maio 2023.
dc.identifier.doi10.1016/j.jpcs.2005.11.006
dc.identifier.issn0022-3697
dc.identifier.issne- 1879-2553
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022369705006335
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectD. Electron paramagnetic resonance (EPR)
dc.titleEPR study of Cu(II) dopant ions in single crystals of bis(l-asparaginato)Zn(II)
dc.typeArtigo

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