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 | 2025-04-10T11:17:55Z | |
| dc.date.available | 2025-04-10T11:17:55Z | |
| dc.date.issued | 2003 | |
| 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 (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-ID | 10.1016/S0143-7208(02)00125-0 | |
| dc.identifier.uri | http://hdl.handle.net/20.500.14701/53054 | |
| dc.title | Photophysical and photochemical characteristics of an azlactone dye in sol-gel matrix; a new fluorescent pH indicator | |
| dc.type | Article |