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Molecular Recognition via Hydrogen Bonding at the Air−Water Interface:  An Isotherm and Fourier Transform Infrared Reflection Spectroscopy Study

Weck, Marcus and Rink, Ralf and Ringsdorf, Helmut (1997) Molecular Recognition via Hydrogen Bonding at the Air−Water Interface:  An Isotherm and Fourier Transform Infrared Reflection Spectroscopy Study. Langmuir, 13 (13). pp. 3515-3522. ISSN 0743-7463. https://resolver.caltech.edu/CaltechAUTHORS:20180719-160851370

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Abstract

Molecular recognition in Langmuir monolayers at the air−water interface as a function of headgroup orientation and substrate using isotherms and in-situ Fourier transform infrared (FT-IR) reflection spectroscopy has been investigated. Isotherm measurements show that urea and 2,4,6-triaminopyrimidine (TAP) are specifically bound to barbituric acid lipid monolayers. As expected, TAP causes a larger shift in the limiting area of the isotherms than urea due to steric requirements. The peak positions of the CH stretching vibrations of the barbituric acid lipids indicate that the alkyl chains of barbituric acid lipids 1−3 are in a close-packed all-trans conformation both before and after the recognition process. The complexation of TAP is monitored in situ using external reflection FT-IR spectroscopy through shifts of the conformation-sensitive carbonyl frequencies in the head group region, while no shifts in the carbonyl peaks are observed when urea recognizes the lipid monolayers.


Item Type:Article
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URLURL TypeDescription
https://dx.doi.org/10.1021/la970095rDOIArticle
Additional Information:© 1997 American Chemical Society. Received January 21, 1998. In Final Form: May 18, 1998.
Issue or Number:13
Record Number:CaltechAUTHORS:20180719-160851370
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180719-160851370
Official Citation:Molecular Recognition via Hydrogen Bonding at the Air−Water Interface:  An Isotherm and Fourier Transform Infrared Reflection Spectroscopy Study Marcus Weck, Ralf Fink, and Helmut Ringsdorf Langmuir 1997 13 (13), 3515-3522 DOI: 10.1021/la970095r
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88038
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Jul 2018 23:14
Last Modified:03 Oct 2019 20:02

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