Document Detail

Base Induced Photo-Tautomerization in 7-Hydroxy-4-(Trifluoromethyl)-Coumarin.
MedLine Citation:
PMID:  23190375     Owner:  NLM     Status:  Publisher    
Excited state proton transfer dynamics between 7-hydroxy-4-(trifluoromethyl)-coumarin and 1-methylimidazole base in toluene were studied using ultrafast pump-probe and time-resolved emission methods. Charge transfer excitation of the hydroxycoumarin shifts electron density from the hydroxyl group to the carbonyl, resulting in an excited state where proton transfer to base is highly favored. In addition to its the photoacid characteristics, the shift in the hydroxycoumarin electronic distribution give it characteristics of a photobase as well. The result is a tautomerization process occurring on the picosecond time scale in which the 1-methylimidazole base acts as a proton transfer shuttle from the hydroxyl group to the carbonyl.
Brittany Cole Westlake; Jared J Paul; Stephanie Bettis; Shaun Hampton; Brian P Mehl; Thomas J Meyer; John Michael Papanikolas
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-28
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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