Photophysical and photochemical characteristics of an azlactone dye in sol-gel matrix;: a new fluorescent pH indicator
| dc.contributor.author | Ertekin, K | |
| dc.contributor.author | Karapire, C | |
| dc.contributor.author | Alp, S | |
| dc.contributor.author | Yenigül, B | |
| dc.contributor.author | Içli, S | |
| dc.date.accessioned | 2024-07-18T12:02:57Z | |
| dc.date.available | 2024-07-18T12:02:57Z | |
| dc.description.abstract | The 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 (Q(f) = 0.296) and fluorescence emission lifetime (tau(f) = 0.47 ns) compared to Q(f) = 0.0027-0.0025 and tau(f) = 0.02-0.03 ns for solutions in MeCN and THF. The acidity constant of DPO vas 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. (C) 2002 Elsevier Science Ltd. All rights reserved. | |
| dc.identifier.issn | 0143-7208 | |
| dc.identifier.uri | http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/8774 | |
| dc.language.iso | English | |
| dc.publisher | ELSEVIER SCI LTD | |
| dc.subject | SENSOR | |
| dc.title | Photophysical and photochemical characteristics of an azlactone dye in sol-gel matrix;: a new fluorescent pH indicator | |
| dc.type | Article |