AI Article Synopsis
- The study explores how small molecules interact with larger noncovalent assemblies, specifically examining the interaction of fluorophenol isomers with sunset yellow, which forms noncovalent aggregates.
- Researchers used two NMR spectroscopic methods to analyze these interactions, leveraging the fluorine-19 nucleus as a means to track changes in chemical shifts and diffusion coefficients.
- Results suggest that at low concentrations, fluorophenol binds to sunset yellow aggregates in an end-on fashion, while at higher concentrations, it tends to insert into the stacks of the aggregates.
Article 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.
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