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  Hydrophobic Gaps of Steroid Size in a Surface Monolayer Collect 1,2-trans-Cyclohexanediol and Glucose from Bulk Water

Fuhrhop, J.-H., Bedurke, T., Gnade, M., Schneider, J., & Doblhofer, K. (1997). Hydrophobic Gaps of Steroid Size in a Surface Monolayer Collect 1,2-trans-Cyclohexanediol and Glucose from Bulk Water. Langmuir, 13(3), 455-459. doi:10.1021/la960990v.

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Fuhrhop, Jürgen-Hinrich1, Author
Bedurke, Thomas1, Author
Gnade, Michael1, Author
Schneider, Johannes1, Author
Doblhofer, Karl2, Author              
Affiliations:
1Institut für Organische Chemie der Freien Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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 Abstract: Mixed monolayers made of steroid thiol molecules lying flat on the surface and thin octadecanethiol walls have been prepared on gold by subsequent chemisorption and self-assembly procedures. Cyclovoltammetry of ferricyanide in bulk water showed 30% of the peak current observed for naked gold electrodes. 1,2-trans-Cyclohexanediol interrupted ferricyanide penetration into the steroid membrane gaps almost quantitatively; its 1,2-cis diastereomer, on the other hand, had practically no blocking effect. Glucose, galactose, and mannose were also efficient blockers for ion penetration into the hydrophobic gaps. Infrared spectroscopy, quartz balance, radioactivity, impedance, and contact angle measurements on the monolayers and its physisorbed entrapments were used to characterize the membrane system and the unique physisorption process of the highly water-soluble compounds in hydrophobic gaps. A model based on the fitting of polyols with a cyclohexane skeleton and equatorial OH-groups into icelike water clusters and the slowdown of diffusion processes in such rigid and shielded clusters is proposed.

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Language(s): eng - English
 Dates: 1996-10-151997-02-01
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/la960990v
 Degree: -

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Title: Langmuir
  Abbreviation : Langmuir
Source Genre: Journal
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Publ. Info: Columbus, OH : American Chemical Society
Pages: 5 Volume / Issue: 13 (3) Sequence Number: - Start / End Page: 455 - 459 Identifier: ISSN: 0743-7463
CoNE: https://pure.mpg.de/cone/journals/resource/954925541194