Photophysical and photochemical characteristics of an azlactone dye in sol-gel matrix; a new fluorescent pH indicator

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dc.contributor.authorErtekin K.
dc.contributor.authorKarapire C.
dc.contributor.authorAlp S.
dc.contributor.authorYenigül B.
dc.contributor.authorIçli S.
dc.date.accessioned2024-07-22T08:25:00Z
dc.date.available2024-07-22T08:25:00Z
dc.date.issued2003
dc.description.abstractThe photophysical and photochemical properties of an azlactone derivative, 4-(p-N,N-dimethylaminophenylmethylene)-2-phenyl-5-oxazolone, (DPO) in a sol-gel matrix have been examined. The fluorescence quantum yield, radiative lifetime, fluorescence lifetime, fluorescence rate constant and singlet energy values of the DPO dye were determined in a modified tetraethyl orthosilicate (TEOS) solid matrix by absorption and emission spectroscopy and obtained data were compared with the results of measurements in acetonitrile (MeCN) and tetrahydrofuran (THF) solution. The sol-gel matrix enhanced the fluorescence quantum yield (Qf=0.296) and fluorescence emission lifetime (τf=0.47 ns) compared to Qf=0.0027-0.0025 and τf=0.02-0.03 ns for solutions in MeCN and THF. The acidity constant of DPO was found to be as pKa=5.1 in the transparent sol-gel matrix. The dye doped sol-gel exhibited a pH sensitivity in pH range 3.0-7.0. © 2002 Elsevier Science Ltd. All rights reserved.
dc.identifier.DOI-ID10.1016/S0143-7208(02)00125-0
dc.identifier.issn01437208
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/20230
dc.language.isoEnglish
dc.subjectAbsorption spectroscopy
dc.subjectAcidity
dc.subjectDoping (additives)
dc.subjectEmission spectroscopy
dc.subjectFluorescence
dc.subjectpH effects
dc.subjectPhotochemical reactions
dc.subjectRate constants
dc.subjectSol-gels
dc.subjectdye
dc.subjectFluorescence lifetime
dc.subjectDyes
dc.titlePhotophysical and photochemical characteristics of an azlactone dye in sol-gel matrix; a new fluorescent pH indicator
dc.typeArticle

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