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Excited-state proton transfer and geminate recombination in the molecular cage of β-cyclodextrin

Paper ID Volume ID Publish Year Pages File Format Full-Text
28829 44094 2008 5 PDF Available
Title
Excited-state proton transfer and geminate recombination in the molecular cage of β-cyclodextrin
Abstract

Excited-state proton transfer and geminate recombination in aqueous heptakis(2,6-di-O-methyl)-β-cyclodextrin have been compared with those in water by monitoring the photoinduced prototropic tautomerization of 6-hydroxyquinoline, which occurs via forming anionic intermediate. Enol deprotonation decelerates by 18 times whereas its reverse process accelerates slightly with encapsulation. The imine protonation of the intermediate slows down by 8.2 times in the molecular cage. These unusual kinetic features have been explained with the geminate recombination of protons as well as the structural dynamics of solvent molecules and the relative energetics of involved species.

Keywords
Excited-state proton transfer; Heptakis(2,6-di-O-methyl)-β-cyclodextrin; 6-Hydroxyquinoline; Geminate recombination; Solvation energy
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Excited-state proton transfer and geminate recombination in the molecular cage of β-cyclodextrin
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 194, Issue 1, 5 February 2008, Pages 105–109
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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