Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study

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dc.creatorCalvo, Rafael
dc.creatorRapp, Raul Edgardo
dc.creatorSartoris, Rosana P.
dc.creatorSantana, Ricardo Costa de
dc.creatorPerec, Mireille
dc.date.accessioned2024-07-11T15:06:18Z
dc.date.available2024-07-11T15:06:18Z
dc.date.issued2009
dc.description.abstractWe report powder EPR measurements at 9.48 GHz and temperatures of 4 K ≤ T ≤ 300 K and at 33.86 GHz and T = 300 K for the polymeric compound {[Cu2Er2(L)10(H2O)4]·3H2O}n (HL = trans-2-butenoic acid) having alternate Cu2 and Er2 dinuclear units bridged by carboxylates along a chain. Above 70 K, when the ErIII resonance is unobservable and uncoupled from the CuII ions, the spectrum arises from the excited triplet state of antiferromagnetic Cu2 units, decreasing in intensity as T decreases, and disappearing when these units condensate into the singlet ground state. Fit of a model to the spectra at 9.48 and 33.86 GHz and 300 K gives gCu∥ = 2.379, gCu⊥ = 2.065, DCu = −0.340 cm−1, and ECu ∼ 0 for the g-factors and zero field splitting parameters. From the T dependence of the intensity of the spectrum above 70 K, we obtain JCu−Cu = −336(11) cm−1 for the intradinuclear exchange interaction. Below 50 K, a spectrum attributed to Er2 units appears, narrows, and resolves as T decreases, due to the increase of the spin−lattice relaxation time T1. The spectrum at 4 K allows calculating g values g1 = 1.489, g2 = 2.163, and g3 = 5.587 and zero field splitting parameters DEr = −0.237 cm−1 and EEr = 0.020 cm−1. The results are discussed in terms of the properties of the Cu and Er ions, and the crystal structure of the compound.
dc.identifier.citationCALVO, Rafael; RAPP, Raul E.; SARTORIS, Rosana P.; SANTANA, Ricardo C.; PEREC, Mireille. Alternate Cu 2 and Er 2 spin carriers in a carboxylate-bridged chain: EPR study. Journal of Physical Chemistry A, Washington, v. 113, n. 31, p. 8830-8833, 2009. DOI: 10.1021/jp905310t. Disponível em: https://pubs.acs.org/doi/10.1021/jp905310t. Acesso em: 26 maio 2023.
dc.identifier.doi10.1021/jp905310t
dc.identifier.issn1089-5639
dc.identifier.issne- 1520-5215
dc.identifier.urihttps://pubs.acs.org/doi/10.1021/jp905310t
dc.language.isoeng
dc.publisher.countryEstados unidos
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.titleAlternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
dc.typeArtigo

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