Issue 29, 2006

On the unusual fluorescence properties of xanthone in water

Abstract

Photo-excited xanthone is known to undergo ultrafast intersystem crossing (ISC) in the 1 ps time domain. Correspondingly, its fluorescence quantum yield in most solvents is very small (∼10−4). Surprisingly, the quantum yield in water is 100 times larger, while ISC is still rapid (∼1 ps), as seen by ultrafast pump probe absorption spectroscopy. Temperature dependent steady state and time resolved fluorescence experiments point to a delayed fluorescence mechanism, where the triplet 3nπ* state primarily accessed by ISC is nearly isoenergetic with the photo-excited 1ππ* state. The delayed fluorescence of xanthone in water decays with a time constant of 700 ps, apparently by internal conversion between the 3nπ* state and the lowest lying triplet state 3ππ*.

Graphical abstract: On the unusual fluorescence properties of xanthone in water

Article information

Article type
Paper
Submitted
09 Mar 2006
Accepted
06 Jun 2006
First published
22 Jun 2006

Phys. Chem. Chem. Phys., 2006,8, 3432-3439

On the unusual fluorescence properties of xanthone in water

B. Heinz, B. Schmidt, C. Root, H. Satzger, F. Milota, B. Fierz, T. Kiefhaber, W. Zinth and P. Gilch, Phys. Chem. Chem. Phys., 2006, 8, 3432 DOI: 10.1039/B603560D

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