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Excited-state levels and relaxation processes of chromone and 6-fluorochromone vapors

Paper ID Volume ID Publish Year Pages File Format Full-Text
27513 44028 2010 6 PDF Available
Title
Excited-state levels and relaxation processes of chromone and 6-fluorochromone vapors
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, π*) phosphorescence accompanied by weak S1(n, π*) delayed fluorescence. It is inferred from the temperature dependence of the phosphorescence intensity that the 3(n, π*) state is located at energies below the 3(π, π*) 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.

Keywords
Chromone; Vapor phase; Phosphorescence; Temperature dependence; Energy levels
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Excited-state levels and relaxation processes of chromone and 6-fluorochromone vapors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 214, Issue 1, 5 July 2010, Pages 10–15
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
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