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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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Ground-state proton transfer of 7-hydroxyquinoline confined in biologically relevant water nanopools

Cited 20 times inthomson ciCited 19 times inthomson ci
Title
Ground-state proton transfer of 7-hydroxyquinoline confined in biologically relevant water nanopools
Author
Park, S.-Y.Kwon, Oh HoonKim, T.G.Jang, D.-J.
Keywords
AOT reverse micelles; Bulk water; Formation energies; Hydroxyquinolines; Kinetic profiles; Local gradients; Nanopools; Optimal configurations; Probe molecules; Reaction coordinates; Reverse proton transfer; Shift time; Solvent polarization; Time-resolved; Transfer time; Transient absorption
Issue Date
2009-09
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.113, no.36, pp.16110 - 16115
Abstract
The ground-state reverse proton transfer of 7-hydroxyquinoline catalyzed by water confined in AOT reverse micelles has been investigated by measuring time-resolved transient-absorption spectra and kinetic profiles. The transfer time is profoundly retarded in water nanopools compared with that in bulk water (26 μs) although it diminishes with the size increase of the water nanopool. The spectral-shift time of tautomeric transient absorption agrees well with the proton transfer time. The probe molecule is subject to the local gradient of polarity, whose magnitude is altered with the sizes of water nanopools. Accordingly, the observations made in this study indicate the multidimensional character of reaction coordinates, in which solvent polarization coupled to charge transfer plays a seminal role in the control of overall proton-transfer dynamics. The retardation of proton transfer in water nanopools is ascribed to the increased formation energy of a charge-transferred optimal configuration, which is prerequisite to facile intrinsic proton transfer via tunneling.
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DOI
10.1021/jp903693f
ISSN
1932-7447
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PHY_Journal Papers
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