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

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journal contribution
posted on 2023-06-08, 16:18 authored by Jonathan R Katz, Lucy J Day, Iain Day
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.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Journal of Physical Chemistry B

ISSN

1520-6106

Publisher

American Chemical Society

Issue

39

Volume

117

Page range

11793-11800

Department affiliated with

  • Chemistry Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2013-11-12

First Open Access (FOA) Date

2014-08-29

First Compliant Deposit (FCD) Date

2014-06-09

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