NMR investigations of the interaction between the azo-dye sunset yellow and Fluorophenol

Katz, Jonathan R, Day, Lucy J and Day, Iain J (2013) NMR investigations of the interaction between the azo-dye sunset yellow and Fluorophenol. Journal of Physical Chemistry B, 117 (39). pp. 11793-11800. ISSN 1520-6106

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Abstract

The interaction of small molecules with larger noncovalent assemblies is important across a wide range of disciplines. Here, we apply two complementary NMR spectroscopic methods to investigate the interaction of various fluorophenol isomers with sunset yellow. This latter molecule is known to form noncovalent aggregates in isotropic solution, and form liquid crystals at high concentrations. We utilize the unique fluorine-19 nucleus of the fluorophenol as a reporter of the interactions via changes in both the observed chemical shift and diffusion coefficients. The data are interpreted in terms of the indefinite self-association model and simple modifications for the incorporation of a second species into an assembly. A change in association mode is tentatively assigned whereby the fluorophenol binds end-on with the sunset yellow aggregates at low concentration and inserts into the stacks at higher concentrations.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science > QD Chemistry > QD0071 Analytical chemistry
Depositing User: Iain Day
Date Deposited: 12 Nov 2013 15:44
Last Modified: 06 Mar 2017 01:36
URI: http://sro.sussex.ac.uk/id/eprint/46996

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