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Issue 9, 2016
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Thioxanthone in apolar solvents: ultrafast internal conversion precedes fast intersystem crossing

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Abstract

The photophysics of thioxanthone dissolved in cyclohexane was studied by femtosecond fluorescence and transient absorption spectroscopy. From these experiments two time constants of ∼400 fs and ∼4 ps were retrieved. With the aid of quantum chemically computed spectral signatures and rate constants for intersystem crossing, the time constants were assigned to the underlying processes. Ultrafast internal conversion depletes the primarily excited 1ππ* state within ∼400 fs. The 1nπ* state populated thereby undergoes fast intersystem crossing (∼4 ps) yielding the lowest triplet state of 3ππ* character.

Graphical abstract: Thioxanthone in apolar solvents: ultrafast internal conversion precedes fast intersystem crossing

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Article information


Submitted
09 Nov 2015
Accepted
01 Feb 2016
First published
12 Feb 2016

This article is Open Access

Phys. Chem. Chem. Phys., 2016,18, 6637-6647
Article type
Paper

Thioxanthone in apolar solvents: ultrafast internal conversion precedes fast intersystem crossing

R. Mundt, T. Villnow, C. T. Ziegenbein, P. Gilch, C. Marian and V. Rai-Constapel, Phys. Chem. Chem. Phys., 2016, 18, 6637
DOI: 10.1039/C5CP06849E

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