Fluorescence emission studies of an azlactone derivative embedded in polymer films - An optical sensor for pH measurements

Basit Öğe Kaydı
dc.contributor.authorErtekin, K
dc.contributor.authorAlp, S
dc.contributor.authorKarapire, C
dc.contributor.authorYenigul, B
dc.contributor.authorHenden, E
dc.contributor.authorIcli, S
dc.date.accessioned2019-10-27T18:21:49Z
dc.date.available2019-10-27T18:21:49Z
dc.date.issued2000
dc.departmentEge Üniversitesien_US
dc.description.abstractAzlactone molecules can be protonated in acidic media, and the process of protonation is irreversible due to ring opening in solutions. A new fully reversible pH sensor has been developed 4-(p-N,N-dimethylamino phenyl methylene)-2-phenyl-5-oxazolone (DPO), an azlactone derivative, embedded in a plasticized PVC polymer film. The sensor membrane is completely transparent and exhibits pH induced color change which is capable of measuring of pH in the range 1-7 and has a pK(a) value of 3.4. In agreement with crystal phase studies, DPO displays enhanced fluorescence emission quantum yield, Q(f) = 0.52, and fluorescence emission lifetime, tau (f) = 1.35 ns, in immobilized PVC film matrix, compared to Q(f) congruent to 0.03 and tau (f) = 0.02-0.03 ns in solutions. Stokes shift decreased to 46 nm in plasticized PVC film, with respect to Stokes shift of 81 nm in acetonitrile solution. Singlet energy, E-s = 60.4 kcal mol(-1), of DPO in PVC film, which is 1.1-1.4 kcal mol(-1) lower with respect to solutions, is taken as evidence of lessened singlet-triplet crossings in excited state of DPO in immobilized phase, and result in enhanced fluorescence emissions. (C) 2000 Elsevier Science B.V All rights reserved.en_US
dc.identifier.doi10.1016/S1010-6030(00)00358-0
dc.identifier.endpage161en_US
dc.identifier.issn1010-6030
dc.identifier.issn1010-6030en_US
dc.identifier.issue02.Maren_US
dc.identifier.startpage155en_US
dc.identifier.urihttps://doi.org/10.1016/S1010-6030(00)00358-0
dc.identifier.urihttps://hdl.handle.net/11454/35935
dc.identifier.volume137en_US
dc.identifier.wosWOS:000165578500012en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofJournal of Photochemistry and Photobiology A-Chemistryen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectoptical sensoren_US
dc.subjectfluorescence emissionen_US
dc.subjectazlactoneen_US
dc.subjectpHen_US
dc.subjectpolymer filmen_US
dc.titleFluorescence emission studies of an azlactone derivative embedded in polymer films - An optical sensor for pH measurementsen_US
dc.typeArticleen_US

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu