Journal
CHEMICAL PHYSICS LETTERS
Volume 363, Issue 3-4, Pages 409-414Publisher
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DOI: 10.1016/S0009-2614(02)01233-2
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We report on emission studies of 1-hydroxy-2-acetonaphthone (HAN) in solution nanocavities. In neutral water solutions, intramolecular proton transfer in the enol (E*) structure of HAN and a subsequent internal rotation in the formed keto-type tautomer (K*) occur in few tens of ps, to produce a ns-living rotamers (KR*). When caging HAN in cyclodextrins, the dynamics of twisting is greatly affected. Depending on the size of the cage, the isomerization channel leading to KR* can be closed, and emission occurs from K*. In a larger caging cavity, the fast component of the anisotropy decay becomes shorter while the slow one becomes longer. (C) 2002 Elsevier Science B.V. All rights reserved.
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