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Gas-phase water-mediated equilibrium between methylglyoxal and its geminal diol.

Abstract：

:In aqueous solution, aldehydes, and to a lesser extent ketones, hydrate to form geminal diols. We investigate the hydration of methylglyoxal (MG) in the gas phase, a process not previously considered to occur in water-restricted environments. In this study, we spectroscopically identified methylglyoxal diol (MGD) and obtained the gas-phase partial pressures of MG and MGD. These results, in conjunction with the relative humidity, were used to obtain the equilibrium constant, K(P), for the water-mediated hydration of MG in the gas phase. The Gibbs free energy for this process, DeltaG(o), obtained as a result, suggests a larger than expected gas-phase diol concentration. This may have significant implications for understanding the role of organics in atmospheric chemistry.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Axson JL,Takahashi K,De Haan DO,Vaida V

doi

10.1073/pnas.0912121107

subject

Has Abstract

pub_date

2010-04-13 00:00:00

pages

6687-92

issue

15

eissn

0027-8424

issn

1091-6490

pii

0912121107

journal_volume

107

pub_type

杂志文章

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