Source:http://linkedlifedata.com/resource/pubmed/id/16081697
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
5739
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| pubmed:dateCreated |
2005-8-26
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| pubmed:abstractText |
In general, the formation and dissociation of solute-solvent complexes have been too rapid to measure without disturbing the thermal equilibrium. We were able to do so with the use of two-dimensional infrared vibrational echo spectroscopy, an ultrafast vibrational analog of two-dimensional nuclear magnetic resonance spectroscopy. The equilibrium dynamics of phenol complexation to benzene in a benzene-carbon tetrachloride solvent mixture were measured in real time by the appearance of off-diagonal peaks in the two-dimensional vibrational echo spectrum of the phenol hydroxyl stretch. The dissociation time constant tau(d) for the phenol-benzene complex was 8 picoseconds. Adding two electron-donating methyl groups to the benzene nearly tripled the value of tau(d) and stabilized the complex, whereas bromobenzene, with an electron-withdrawing bromo group, formed a slightly weaker complex with a slightly lower tau(d). The spectroscopic method holds promise for studying a wide variety of other fast chemical exchange processes.
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| pubmed:commentsCorrections | |
| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Aug
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| pubmed:issn |
1095-9203
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| pubmed:author | |
| pubmed:issnType |
Electronic
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| pubmed:day |
26
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| pubmed:volume |
309
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
1338-43
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| pubmed:dateRevised |
2007-3-19
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| pubmed:year |
2005
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| pubmed:articleTitle |
Ultrafast dynamics of solute-solvent complexation observed at thermal equilibrium in real time.
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| pubmed:affiliation |
Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
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| pubmed:publicationType |
Journal Article
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