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dc.contributor.authorObara, P. A.-
dc.contributor.authorSarmento, V. H. V.-
dc.contributor.authorRibeiro, S. J. L.-
dc.contributor.authorNalin, M.-
dc.contributor.authorMolina, C.-
dc.identifier.citationOptical Materials, v. 46, p. 64-69, 2015.-
dc.description.abstractDi-ureasil organic-inorganic hybrids have been used together with Phosphotungstic acid (PWA- H3PW12O40) in the preparation of new photochromic materials. PWA was incorporated in different relative concentrations in di-ureasils displaying different organic chain lengths. The structure and photochromic behaviour of these novel material were investigated by means of infrared (FTIR), photoluminescence (PL) and Ultraviolet-Visible (UV-Vis) spectroscopies and Small Angle X-ray Scattering (SAXS) technique as a function of PWA content and also of the polymer chain length. Eu3+ has been incorporated as probe ion. For the short polymer chains, europium and PWA keggin structures are located close to oxygen in the ether type of the polyoxides segments and for the long polymer chain carbonyl groups of the urea units were observed to contribute in the coordination. Moreover, the photochromic effect was followed by UV-Vis measurements which showed that in both hybrid families changing from colorless to blue after UV exposure, and the bleaching process, depend directly on the polymer chain length and the nature of the sites where PWA are coordinated in the matrix. (C) 2015 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipBrazilian Synchrotron Light Laboratory (LNLS) SAXS beamline-
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.titlePWA-diureasils organic-inorganic hybrids: photochromism and effect of the organic chain lengthen
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)-
dc.contributor.institutionUniversidade Federal de Sergipe (UFS)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv Fed Sao Paulo, Inst Ciencias Ambientais Quim &Farmaceut, Diadema, SP, Brazil-
dc.description.affiliationUniv Fed Sergipe, Dept Quim, Itabaiana, SE, Brazil-
dc.description.affiliationUniv Estadual Paulista UNESP, Inst Quim, Araraquara, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista UNESP, Departamento de Química Geral e Inorgânica, Inst Quim, Araraquara, SP, Brazil-
dc.description.sponsorshipIdFAPESP: 2012/02708-8-
dc.description.sponsorshipIdBrazilian Synchrotron Light Laboratory (LNLS) SAXS beamline: D11A-SAXS-10927-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofOptical Materials-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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