| Excited-State Double Proton Transfer of 7-Azaindole Dimers in a Low-Temperature Organic Glass. | |
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MedLine Citation:
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PMID: 21413991 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The excited-state double proton transfer of model DNA base pairs, 7-azaindole dimers, is explored in a low-temperature organic glass of n-dodecane using picosecond time-resolved fluorescence spectroscopy. Reaction mechanisms are found to depend on the conformations of 7-azaindole dimers at the moment of excitation; whereas planar conformers tautomerize rapidly (<10 ps), twisted conformers undergo double proton transfer to form tautomeric dimers on the time scale of 250 ps at 8 K. The proton transfer is found to consist of two orthogonal steps: precursor-configurational optimization and intrinsic proton transfer via tunneling. The rate is almost isotope-independent at cryogenic temperatures because configurational optimization is the rate-determining step of the overall proton transfer. This optimization is assisted by lattice vibrations below 150 K or by librational motions above 150 K. |
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Authors:
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Hyeongtaek Lim; Sun-Young Park; Du-Jeon Jang |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-17 |
Journal Detail:
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Title: Photochemistry and photobiology Volume: - ISSN: 1751-1097 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0376425 Medline TA: Photochem Photobiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Journal compilation © 2011 American Society for Photobiology. |
Affiliation:
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School of Chemistry, Seoul National University, NS60, Seoul 151-747, Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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