Excited-state levels and relaxation processes of chromone and 6-fluorochromone vapors
Journal of Photochemistry and Photobiology A: Chemistry Volume 214 Issue 1
Page 10-15
published_at 2010-07-05
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| File | |
| Title ( eng ) |
Excited-state levels and relaxation processes of chromone and 6-fluorochromone vapors
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| Creator | |
| Source Title |
Journal of Photochemistry and Photobiology A: Chemistry
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| Volume | 214 |
| Issue | 1 |
| Start Page | 10 |
| End Page | 15 |
| Abstract |
Emission and excitation spectra of chromone and 6-fluorochromone have been measured in the vapor phase at different temperatures and pressures along with the absorption spectra. The emission is shown to consist of the (3)(n, pi*) phosphorescence accompanied by weak S-1 (n, pi*) delayed fluorescence. It is inferred from the temperature dependence of the phosphorescence intensity that the (3)(n, pi*) state is located at energies below the (3)(pi, pi*) state for chromone and 6-fluorochromone vapors. The relaxation processes in the vapor phase are discussed based on the pressure and excitation energy dependence of the relative phosphorescence yields. The data include the vibrational analyses of the emission spectra based on the results of the DFT calculations at the B3LYP/6-311 + G(p, d) level.
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| Keywords |
Chromone
Vapor phase
Phosphorescence
Temperature dependence
Energy levels
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| NDC |
Chemistry [ 430 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
Elsevier Science BV
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| Date of Issued | 2010-07-05 |
| Rights |
Copyright (c) 2010 Elsevier B.V.
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| Publish Type | Author’s Original |
| Access Rights | open access |
| Source Identifier |
[ISSN] 1010-6030
[DOI] 10.1016/j.jphotochem.2010.05.022
[NCID] AA10684407
[DOI] http://dx.doi.org/10.1016/j.jphotochem.2010.05.022
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