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  Influence of concentration and temperature on the dynamics of water in the hydrophobic hydration shell of tetramethylurea

Tielrooij, K.-J., Hunger, J., Buchner, R., Bonn, M., & Bakker, H. J. (2010). Influence of concentration and temperature on the dynamics of water in the hydrophobic hydration shell of tetramethylurea. Journal of the American Chemical Society, 132(44), 15671-15678. doi:10.1021/ja106273w.

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Tielrooij, Klaas-Jan, Author
Hunger, Johannes1, Author           
Buchner, Richard, Author
Bonn, Mischa, Author           
Bakker, Huib J, Author
Affiliations:
1FOM Institute for Atomic and Molecular Physics [AMOLF], Netherlands, ou_persistent22              

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Free keywords: Hydrophobic and Hydrophilic Interactions,Methylurea Compounds,Methylurea Compounds: chemistry,Temperature,Water,Water: chemistry
 Abstract: We study the influence of the amphipilic compound tetramethylurea (TMU) on the dynamical properties of water, using dielectric relaxation spectroscopy in the regime between 0.2 GHz and 2 THz. This technique is capable of resolving different water species, their relative fractions, and their corresponding reorientation dynamics. We find that the reorientation dynamics of water molecules in the hydration shell of the hydrophobic groups of TMU is between 3 (at low concentrations) and 10 (at higher concentrations) times slower than the dynamics of bulk water. The data indicate that the effect of hydrophobic groups on water is strong but relatively short-ranged. With increasing temperature, the fraction of water contained in the hydrophobic hydration shell decreases, which implies that the overall effect of hydrophobic groups on water becomes smaller.

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 Dates: 2010-11
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/ja106273w
BibTex Citekey: TMUs
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Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 132 (44) Sequence Number: - Start / End Page: 15671 - 15678 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870