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Near Infrared Photochemistry of Pyruvic Acid in Aqueous Solution.
MedLine Citation:
PMID:  22233273     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Recent experimental and theoretical results have suggested that organic acids such as pyruvic acid, can be photolyzed in the ground electronic state by the excitation of the OH stretch vibrational overtone. These overtones absorb in the near infrared and visible region of the spectrum where the solar photons are plentiful and could provide a reaction pathway for the organic acids and alcohols which are abundant in the earth's atmosphere. In this paper the overtone initiated photochemistry of aqueous pyruvic acid is investigated by monitoring the evolution of carbon dioxide. In these experiments CO2 is being produced by excitation in the near infrared, between 850 nm and ~1150 nm (11,765 cm-1 - 8696 cm-1), where the second OH vibrational overtone (Dn=3) of pyruvic acid is expected to absorb. These findings show that not only does the overtone initiated photochemical decarboxylation reaction occur, but that in the aqueous phase it occurs at a lower energy than was predicted for the overtone initiated reaction of pyruvic acid in the gas phase (13,380 cm-1). A quantum yield of 3.5+/-1.0x10-4 is estimated, suggesting that although this process does occur, it does so with a very low efficiency.
Authors:
Molly C Larsen; Veronica Vaida
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-10
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  -     ISSN:  1520-5215     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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