A Photophysical Study of the α-Carboline (1-Azacarbazole) Aggregation Process
| Autor: | Manuel Balón, María A. Muñoz, José Sánchez Hidalgo, Carmen Carmona, Emilio Garcia-Fernandez |
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| Rok vydání: | 2012 |
| Předmět: |
Indoles
Light Hydrogen Absorption spectroscopy Pyridines chemistry.chemical_element Photochemistry Biochemistry Fluorescence chemistry.chemical_compound Pyridine Physical and Theoretical Chemistry Indole test Hydrogen bond Chemistry Temperature Hydrogen Bonding General Medicine Photochemical Processes Kinetics Spectrometry Fluorescence Monomer Solvents Thermodynamics Spectrophotometry Ultraviolet Absorption (chemistry) Dimerization Carbolines |
| Zdroj: | Photochemistry and Photobiology. 88:277-284 |
| ISSN: | 0031-8655 |
| DOI: | 10.1111/j.1751-1097.2011.01056.x |
| Popis: | This paper reports a comprehensive photophysical study of the aggregation process of 1-azacarbazole, or α-carboline (9H-pyrido[2,3-b]indole), AC, in low polar aprotic solvents by using absorption, steady state and time-resolved fluorescence spectroscopic techniques. To ascertain the characteristics of the aggregation process we have studied the changes produced by the increase of the AC concentration and the decrease of the temperature on the absorption and fluorescence spectra of the AC monomer. Previously, to aid the interpretation of these results, the hydrogen bonding interactions of the AC monomer with pyridine, PY, and indole, IND, have been also analyzed. The results obtained from these studies reveal that, under our experimental conditions, AC does not form doubly hydrogen bonded cyclic dimers, (AC)(2), but singly hydrogen bonded open dimers, AC-AC, and open higher aggregates, (-AC-)(n). The formation of these species shifts to the red the absorption spectrum of the AC monomer and quenches its fluorescence. |
| Databáze: | OpenAIRE |
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