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The Phosphorescence Excitation Spectrum of Jet-Cooled Xanthione in the Region of the T1←S0 and S1←S0 Absorption Transitions

✍ Scribed by R.P Brint; W.G Doherty; A.A Ruth

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
192 KB
Volume
216
Category
Article
ISSN
0022-2852

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✦ Synopsis

The 3 A 2 (nπ * ) → 1 A 1 X (T 1 → S 0 ) phosphorescence excitation spectrum of jet-cooled xanthione was investigated in the region 14 920-17 600 cm -1 . The structure observed is shown to be due to the T 1 ← S 0 absorption and an assignment in terms of the vibronic structure of that band is proposed. A previous assignment of the S 1 ← S 0 origin is considered in detail and the transition involved is shown to be most probably due to absorption of a vibronic triplet state T 1z,ν7 . An alternative but tentative assignment of the S 1,0 ← S 0,0 transition is suggested. Comparison is made with previous spectroscopic and theoretical work on the molecule and its congeners, 4H-pyran-4-thione and 4H-1-benzopyran-4-thione.

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