Spectrophotometric characteristics of new pyridylindolizine derivatives solutions
| Autor: | Marilena Vasilescu, Rodica Bandula, Florea Dumitrascu, Helge Lemmetyinen |
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| Rok vydání: | 2006 |
| Předmět: |
Sociology and Political Science
Molecular Structure Clinical Biochemistry Substituent Indolizines Photochemistry Biochemistry Fluorescence Solvent Solutions Clinical Psychology chemistry.chemical_compound Spectrometry Fluorescence chemistry Spectrophotometry Pyridine Solvents Physical chemistry Polar Spectrophotometry Ultraviolet Absorption (chemistry) Law Spectroscopy Social Sciences (miscellaneous) |
| Zdroj: | Journal of fluorescence. 16(5) |
| ISSN: | 1053-0509 |
| Popis: | Three new pyridylindolizine derivatives, 1, 2, 3-tricarbometoxi-7-(4-pyridyl)-pyrrolo[1, 2-a]pyridine (I), 1,2-dicarboethoxy-3-(4-bromobenzoyl)-7-(4-pyridyl)-pyrrolo[1,2-a]pyridine (II) and its isomer 1,2-dicarboethoxy-3- (4-bromobenzoyl) -5- (2-pyridyl) -pyrrolo[1, 2-a]pyridine (III) have been investigated in different solutions by UV-VIS absorption, steady-state, and time-resolved fluorescence methods. The effects of the substituent and solvent on the spectroscopic properties have been demonstrated. The fluorescence decay data could be fitted to a single-exponential function. The lifetime values are higher in protic polar than in aprotic apolar solvents for compound I. In the case of compounds II and III the fluorescence intensities and lifetimes are very low, with the exception of III in aprotic solvents. The absorption and fluorescence properties of the compounds showed a solvent dependence. |
| Databáze: | OpenAIRE |
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