Structural and EPR studies of pyrophosphate-bridged dinuclear CuII complexes

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dc.creatorSartoris, Rosana P.
dc.creatorCalvo, Rafael
dc.creatorSantana, Ricardo Costa de
dc.creatorNascimento, Otaciro Rangel
dc.creatorPerec, Mireille
dc.creatorBaggio, Ricardo F.
dc.date.accessioned2024-07-11T14:19:03Z
dc.date.available2024-07-11T14:19:03Z
dc.date.issued2014
dc.description.abstractTwo new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]2 1 and [Cu2(terpy)2(HO7P2)·(H2O4P)·(H3O4P)·(H2O)] 2 (dpa = 2,2′-dipyridylamine and terpy = 2,2′:6′,2″-terpyridine) were isolated and their crystal structures determined by single-crystal X-ray diffraction. The compounds are triclinic and contain dinuclear copperII units bridged by pyrophosphate anions. The EPR spectra observed in three planes of single crystal samples as a function of field orientation at 293 K for compounds 1 and 2, and also for two other pyrophosphate compounds already reported, [Cu(bipy)(cis-H2O7P2)]2·3(H2O) 3 and [Cu(bipy)(trans-H2P2O7)]2 4 display a single resonance for any field orientation and temperatures T between 4 and 293 K, as in mononuclear spin systems, without hyperfine structure, and their g-factors and line widths were measured. The relations between the principal directions of the g-matrices and the molecular structures are discussed and compared with related compounds. The temperature dependences of the intensity of the EPR signals observed for 1–4 above 4 K indicate a paramagnetic Curie behavior, with no indication of intradinuclear exchange interactions (so, |J| < 2 K). The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions, allowing to set a lower limit of their magnitudes.
dc.identifier.citationSARTORIS, Rosana P.; CALVO, Rafael ; SANTANA, Ricardo C.; NASCIMENTO, Otaciro R.; PEREC, Mireille; BAGGIO, Ricardo F. Structural and EPR studies of pyrophosphate-bridged dinuclear CuII complexes. Polyhedron, Amsterdam, v. 79, p. 178-185, 2014. DOI: 10.1016/j.poly.2014.05.002. Disponível: https://www.sciencedirect.com/science/article/pii/S0277538714002988. Acesso em: 25 maio 2023.
dc.identifier.doi10.1016/j.poly.2014.05.002
dc.identifier.issn0277-5387
dc.identifier.issne- 1873-3719
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0277538714002988
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectCopper
dc.subjectPyrophosphates
dc.subjectStructure
dc.subjectMagnetic interactions
dc.subjectEPR
dc.titleStructural and EPR studies of pyrophosphate-bridged dinuclear CuII complexes
dc.typeArtigo

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