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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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Excited-state tautomerization dynamics of 7-hydroxyquinoline in beta-cyclodextrin

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Title
Excited-state tautomerization dynamics of 7-hydroxyquinoline in beta-cyclodextrin
Author
Park, HJKwon, Oh HoonAh, CSJang, DJ
Issue Date
2005-03
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.9, pp.3938 - 3943
Abstract
The excited-state tautomerization dynamics of 7-hydroxyquinoline encapsulated in β-cyclodextrin is compared with that in pure water by measuring isotope-dependent fluorescence kinetics as well as absorption and emission spectra. The normal species tautomerizes stepwise via forming anionic intermediate species in both systems. However, the enol-deprotonation time (40 ps in water) becomes as large as 170 ps whereas the imine-protonation time of the anionic intermediate (160 ps in water) becomes as short as 85 ps in β-cyclodextrin. The slow formation and the fast decay of the anionic species are attributed to the unstability of the charged species in hydrophobic cages. Encapsulation can be utilized to enhance fluorescence enormously and to accelerate selective reactions by retarding other processes.
URI
https://scholarworks.unist.ac.kr/handle/201301/8785
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=15544374544
DOI
10.1021/jp046817m
ISSN
1520-6106
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CHM_Journal Papers
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