Study of copper complexes absorbed on a silica gel surface chemically modified with 5-amino-1,3,4-thiadiazole-2-thiol

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dc.contributor.authorDias, N. L.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:29:34Z
dc.date.available2014-05-20T13:29:34Z
dc.date.issued1998-10-01
dc.description.abstractThe isotherms of adsorption of CuX2 (XCl-, Br-, ClO4-) by silica gel chemically modified with 5-amino-1,3,4-thiadiazole-2-thiol were studied in acetone and ethanol solutions, at 25 degrees C. The following equilibria constants (in L mol(-1)) were determined: (a) CuCl2, 3.2 x 10(3) (ac), 2.5 x 10(3) (eth); (b) CuBr2, 2.9 x 10(3) (ac), 2.3 x 10(3) (eth); (c) Cu(ClO4)(2), 1.8 x 10(3) (ac), 1.2 x 10(3) (eth); ac, acetone; eth, ethanol. The electron spin resonance spectra of the surface complexes indicated a tetragonal-distorted structure in the case of lower degrees of metal loading on the chemically modified surface. The d-d electronic transition spectra showed that for the ClO4- complex, the peak of absorption did not change for any degree of metal loading and for Cl- and Br- complexes, the peak maxima shifted to higher energy with lower metal loadings. (C) 1998 Academic Press.en
dc.description.affiliationUniv Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil
dc.format.extent131-137
dc.identifierhttp://dx.doi.org/10.1006/jcis.1998.5660
dc.identifier.citationJournal of Colloid and Interface Science. San Diego: Academic Press Inc., v. 206, n. 1, p. 131-137, 1998.
dc.identifier.doi10.1006/jcis.1998.5660
dc.identifier.issn0021-9797
dc.identifier.urihttp://hdl.handle.net/11449/10001
dc.identifier.wosWOS:000076375400016
dc.language.isoeng
dc.publisherAcademic Press Inc.
dc.relation.ispartofJournal of Colloid and Interface Science
dc.relation.ispartofjcr5.091
dc.relation.ispartofsjr1,221
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectsilica gelpt
dc.subject5-amino-1,3,4-thiadiazole-2-thiolpt
dc.subjectsilica gel modified with 5-amino-1,3,4-thiadiazole-2-thiolpt
dc.subjectcopper complexpt
dc.subjectelectron spin resonance of copper complexespt
dc.titleStudy of copper complexes absorbed on a silica gel surface chemically modified with 5-amino-1,3,4-thiadiazole-2-thiolen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderAcademic Press Inc.
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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Artigos - Física e Química - FEIS