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Absorption and fluorescence of 8-azasteroids in the gas phase
| Content Provider | Semantic Scholar |
|---|---|
| Author | Borisevich, Nikolai A. Raichyonok, T. F. Sukhodola, A. A. Tolstorozhev, G. B. Shashilov, Victor A. |
| Copyright Year | 2005 |
| Abstract | Extensive studies of the spectral-luminescent characteristics of four 8-azasteroids and a model compound 2-(3,3-dimethyl-1,2,3,4-tetrahydro-1-isoquinolidene)-5,5-dimethyl-1,3-cyclohexanedion in the gas phase have been made. From the analysis of the dependences of the absorption spectra on the vapor pressure (Tlow) and the fluorescence spectra on Tlow and the exciting radiation wavelength (λexc) a conclusion on the presence in the vapors of the investigated 8-azasteroids of three absorption and fluorescence centers (S-, M-, and L-centers) has been drawn. The absorption spectra of these centers strongly overlap. Their long-wave absorption boundaries have been determined. The dependence of the fluorescence spectra of all three centers on λexc, which is inherent in rarefied gases of individual organic molecules, is observed. The S-centers are the molecules of the initial steroids, and the M- and L-centers are the molecules of thermo- and phototransformations of the initial steroids. The model compound in the gas phase is characterized by the same dependences of the fluorescence spectra on Tlow and λexc as those inherent in 8-azasteroids. Taking into account the additional data obtained as a result of investigation of the absorption and fluorescence spectra of solutions of the substances extracted from vacuum cells after the investigation of 8-azasteroids and the model compound in the gas phase, conclusions on the nature of the M- and L-centers have been drawn. |
| Starting Page | 49 |
| Ending Page | 58 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s10812-005-0030-8 |
| Volume Number | 72 |
| Alternate Webpage(s) | https://page-one.springer.com/pdf/preview/10.1007/s10812-005-0030-8 |
| Alternate Webpage(s) | https://doi.org/10.1007/s10812-005-0030-8 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
