Solvent and Temperature Effects on Polymer-Coated Glass Fibers. Fluorescence of the Dansyl Moiety

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Show simple item record González Benito, Francisco Javier Aznar Jiménez, Antonio Baselga Llidó, Juan 2017-11-15T09:58:05Z 2017-11-15T09:58:05Z 2001-12
dc.identifier.bibliographicCitation González-Benito, J., Aznar, A. & Baselga, J. (2001). Solvent and Temperature Effects on Polymer-Coated Glass Fibers. Fluorescence of the Dansyl Moiety. Journal of Fluorescence, 11 (4), pp. 307-314.
dc.identifier.issn 1053-0509
dc.description.abstract E-type glass fibers were coated with poly(γ-aminopropyltriethoxysilane), treating them with a 1% (v/v) monomer aqueous solution. The fibers were labeled with a dansyl-sulfonamide conjugate by reaction of acetonitrile solutions of dansyl chloride with the amine groups immobilized on the glass fiber surface. Interactions of the labeled coating polymer with solvents of different polarities were estimated by measurements of the fluorescence band shifts of the label. It was found that for aprotic solvents, the solvent dipolar coupling relaxation mechanism is dominated by thermodynamic interactions of the solvent with the polymer matrix, while for protic solvents this mechanism is dominated by specific interactions between solvent molecules and the excited state of the chromophore. Different experimental excited-state dipole moments were obtained for nonpolar and polar solvents (μ*ₙₚ = 7.2 ± 1.6 D, μ*ₚ = 11.9 ± 1.5 D). Using the AM1 method, excited-state dipole moments for the first and second singlets were calculated and it was concluded that μ*ₚ ≃ 〈μ*²₁〉½ and μ*ₚ ≃ 〈μ*²₂〉½. Accordingly, neither the glass support nor the coating polar influence the excited-state properties of dansyl. The temperature dependence of dansyl emission allows the determination of the relaxation temperature of the coating polymer, which was estimated as 175 K for the coating used.
dc.description.sponsorship The authors wish to thank the UE Brite EuRam program (BE97-4472) and CAM (07N/0002/1998) for financial support.
dc.format.extent 8
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Plenum Publishing Corporation
dc.rights © Plenum Publishing Corporation, 2002 © Springer Verlag
dc.subject.other Aminopropyl-silanes
dc.subject.other Fluorescence probes
dc.subject.other Dansyl chloride
dc.subject.other Glass fibers
dc.title Solvent and Temperature Effects on Polymer-Coated Glass Fibers. Fluorescence of the Dansyl Moiety
dc.type article
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/BE97/4472
dc.relation.projectID Comunidad de Madrid. CAM (07N/0002/1998)
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 307
dc.identifier.publicationissue 4
dc.identifier.publicationlastpage 314
dc.identifier.publicationtitle Journal of Fluorescence
dc.identifier.publicationvolume 11
dc.identifier.uxxi AR/0000004125
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