Hydrogen bond dynamics in aqueous NaBr solutions.

Hydrogen bond dynamics in aqueous NaBr solutions. Research Abstract Details 

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Hydrogen bond dynamics in aqueous NaBr solutions. Abstract Text:

Sungnam Park,M D Fayer,

Hydrogen bond dynamics of water in NaBr solutions are studied by using ultrafast 2D IR vibrational echo spectroscopy and polarization-selective IR pump-probe experiments. The hydrogen bond structural dynamics are observed by measuring spectral diffusion of the OD stretching mode of dilute HOD in H(2)O in a series of high concentration aqueous NaBr solutions with 2D IR vibrational echo spectroscopy. The time evolution of the 2D IR spectra yields frequency-frequency correlation functions, which permit quantitative comparisons of the influence of NaBr concentration on the hydrogen bond dynamics. The results show that the global rearrangement of the hydrogen bond structure, which is represented by the slowest component of the spectral diffusion, slows, and its time constant increases from 1.7 to 4.8 ps as the NaBr concentration increases from pure water to approximately 6 M NaBr. Orientational relaxation is analyzed with a wobbling-in-a-cone model describing restricted orientational diffusion that is followed by complete orientational randomization described as jump reorientation. The slowest component of the orientational relaxation increases from 2.6 ps (pure water) to 6.7 ps (approximately equal to 6 M NaBr). Vibrational population relaxation of the OD stretch also slows significantly as the NaBr concentration increases.

Hydrogen bond dynamics in aqueous NaBr solutions. Publishing Authors By Initials

S Park,MD Fayer,

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Hydrogen bond dynamics in aqueous NaBr solutions. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Proceedings of the National Academy of Sciences of

VOLUME: 104

Page Numbers: 16731-8

Journal Abbreviation: Proc. Natl. Acad. Sci. U.S.A.

ISSN: 0027-8424

DAY: 11

MONTH: 10

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 7505876

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Grant and Affiliation Information for Hydrogen bond dynamics in aqueous NaBr solutions.

AFFILIATION: Department of Chemistry, Stanford University, Stanford, CA 94305, USA.

Country: United States

AGENCY: United States NIGMS

GRANT: 2R01 GM 061137-05

ACRONYM: GM

MEDLINETA: Proc Natl Acad Sci U S A

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