Document Detail


Base Induced Photo-Tautomerization in 7-Hydroxy-4-(Trifluoromethyl)-Coumarin.
MedLine Citation:
PMID:  23190375     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Brittany Cole Westlake; Jared J Paul; Stephanie Bettis; Shaun Hampton; Brian P Mehl; Thomas J Meyer; John Michael Papanikolas
Related Documents :
23471835 - Reduction of quinones by nadh catalyzed by organoiridium complexes.
16851485 - Comparative density-functional study of the electron paramagnetic resonance parameters ...
17461655 - Density functional theory analysis of the structural and electronic properties of tio2 ...
15601005 - Electrical response of molecular chains from density functional theory.
399735 - The retrograde transport of horseradish peroxidase: problems in the interpretation of i...
16594665 - Multi-frequency high-field epr study of iron centers in malarial pigments.
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:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Expanding the Scope of the Anion Templated Synthesis of Interlocked Structures.
Next Document:  Fabricating a reversible and regenerable Raman-active substrate with a biomolecule-controlled DNA na...