Show simple item record

dc.contributor.author Rizzi, Alberto Claudio
dc.contributor.author Brondino, Carlos Dante
dc.contributor.author Calvo, Rafael
dc.contributor.author Baggio, Ricardo Fortunato
dc.contributor.author Garland, M.T.
dc.contributor.author Rapp, R.E.
dc.date.available 2017-11-20T21:03:02Z
dc.date.issued 2003-12
dc.identifier.citation Rizzi, Alberto Claudio; Brondino, Carlos Dante; Calvo, Rafael; Baggio, Ricardo Fortunato; Garland, M.T.; et al.; Structure and Magnetic Properties of Layered High-Spin Co(II)(L-threonine)2(H2O)2; American Chemical Society; Inorganic Chemistry; 42; 12-2003; 4409-4416
dc.identifier.issn 0020-1669
dc.identifier.uri http://hdl.handle.net/11336/28553
dc.description.abstract We report the structure and the magnetic properties of a cobalt(II) compound with the amino acid L-threonine, Co(C4H8NO3)2(H2O)2. It crystallizes in the orthorhombic chiral space group C2221, with a = 5.843(5) Å, b = 10.120(10) Å, c = 22.36(3) Å, and Z =) 4. The Co(II) ion is in a deformed octahedral environment on a 2-fold symmetry axis parallel to the crystallographic axis b. It is bonded to two threonine molecules in a bidentate fashion, via one oxygen from the carboxylate end and the R-amino nitrogen. A water molecule occupies the third independent site.<br />The Co(II) ions are arranged in layers with intralayer and interlayer distances of 5.84 and 11.18 Å, respectively. Magnetic measurements data reflect the molecular character of a compound with weak exchange interactions. EPR measurements in polycrystalline and single-crystal samples indicate a distorted axial symmetry around the Co(II) ion, as expected from the structural results. Eigenvalues and eigenvectors of the g tensor are determined. The measured principal g values (5.81, 4.56, and 2.23) reflect a high-spin Co(II) ion, as suggested by the type of ligands and the molecular symmetry. From the incomplete collapse of the hyperfine structure we estimate 0.25 <<br />|J| < 1.2 cm-1 between neighboring Co(II) ions within a layer, transmitted through H-bonds. A higher limit |J´| < 0.07 cm-1 is estimated for the exchange interactions between Co(II) ions in neighboring layers. From a global fit of a spin Hamiltonian with spin 3/2 to magnetization and EPR data we obtain a zero field splitting d ~ 231 cm-1 between the two lowest doublet states. The results are discussed in terms of the molecular and electronic structure of the compound.
dc.format application/pdf
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject EPR
dc.subject Co(II)
dc.subject complexes
dc.subject.classification Otras Ciencias Químicas
dc.subject.classification Ciencias Químicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Structure and Magnetic Properties of Layered High-Spin Co(II)(L-threonine)2(H2O)2
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2017-11-16T14:45:58Z
dc.journal.volume 42
dc.journal.pagination 4409-4416
dc.journal.pais Estados Unidos
dc.description.fil Fil: Rizzi, Alberto Claudio. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas. Departamento de Física; Argentina
dc.description.fil Fil: Brondino, Carlos Dante. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil Fil: Baggio, Ricardo Fortunato. Comisión Nacional de Energía Atómica; Argentina
dc.description.fil Fil: Garland, M.T.. Universidad de Chile; Chile
dc.description.fil Fil: Rapp, R.E.. Universidade Federal do Rio de Janeiro; Brasil
dc.journal.title Inorganic Chemistry
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/ic026111b


Archivos asociados

Icon
Blocked Acceso no disponible

This item appears in the following Collection(s)

  • Articulos(INTEC) [1330]
    Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)

Show simple item record

info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)