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Fakultät für Physik


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Impressum
(c) 2002 BMO

"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. 8 (2006) 3432-3439


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 (104). 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 3* 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 3ππ* state and the lowest lying triplet state 3ππ*.

BMO authors (in alphabetic order):
Peter Gilch
Bjoern Heinz
Christopher Root
Helmut Satzger
Bernhard Schmidt
Wolfgang Zinth

Assoziierte Projekte:
Peptide and protein folding
Ultrafast Intersystem Crossing in Aromatic Carbonyl Compounds


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Letzte Änderung: 2016-09-14 13:34