Gas-Phase Water Mediated Equilibrium Study Between Methylglyoxal and its Geminal Diol
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, KP, for the water-mediated hydration of MG in the gas phase. The Gibbs free energy for this process, ΔG°, 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.
© 2009 National Academy of Sciences
Published in final form at:
J. L. Axson, K. Takashashi, D. O. De Haan and V. Vaida, "Gas-Phase Water Mediated Equilibrium Study Between Methylglyoxal and its Geminal Diol." Proc. Nat. Acad. Sci. 107 (15) 6687-6692 (2010).
Axson, Jessica L.; Takahashi, Kaito; De Haan, David O.; and Vaida, Veronica, "Gas-Phase Water Mediated Equilibrium Study Between Methylglyoxal and its Geminal Diol" (2009). Chemistry and Biochemistry Faculty Publications. 20.