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Author Alexandratos, S. D. ♦ Grady, C. E. ♦ Merda, P. ♦ Kaiser, P. T.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ ORGANIC POLYMERS ♦ SORPTIVE PROPERTIES ♦ LIGANDS ♦ ORGANIC COMPOUNDS ♦ ADSORPTION ♦ ADSORPTION ISOTHERMS ♦ MONOCARBOXYLIC ACIDS ♦ AMINES ♦ AROMATICS ♦ PHENOLS ♦ MATHEMATICAL MODELS
Abstract A procedure is developed for quantifying the degree to which a ligand-substrate interaction is affected by the microenvironment surrounding the polymer-supported ligand. The binding constants between a series of substrates (such as substituted benzoic acids, anilines, phenols, etc.) and a ligand covalently bound to different polymer matrices are calculated through the Langmuir isotherms. The binding constants across different matrices quantify the effect of the microenvironment on each ligand-substrate interaction. A linear correlation of the binding constants with the substituent Hammett {sigma} constants yields a slope that is a measure of the interaction`s sensitivity to electron density changes within a given matrix; comparing the slopes across different matrices provides a measure of how the polymeric microenvironment influences that sensitivity. Matrix flexibility is thus found to have a major impact on the ligand-substrate interaction. 19 refs., 2 figs., 1 tab.
ISSN 00027863
Educational Use Research
Learning Resource Type Article
Publisher Date 1992-04-08
Publisher Place United States
Journal Journal of the American Chemical Society
Volume Number 114
Issue Number 8


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