Journal
CHEMICAL PHYSICS LETTERS
Volume 396, Issue 1-3, Pages 102-109Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2004.07.124
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Hypocrellin A (HA) is encapsulated in the mesoporous material MCM-41 for the first time, and its excited-state behaviors are elucidated by means of steady-state spectroscopies and excited-state lifetime measurements. No ground-state tautomer of HA in the mesoporous solid is deduced based on the spectra observed. Normal fluorescence energy level results from the (1, api) state with ppi conjugation;, the excited-state intramolecular proton transfer (ESIPT) fluorescence is mostly due to the two-photon excitation (or absorption) of HA. The ESIPT emission intensity becomes truly remarkable with increasing excitation laser intensities. The time-resolved fluorescence measurements are also performed as the further evidence. (C) 2004 Elsevier B.V. All rights reserved.
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