The formation of a cyclic hydrogen-bonded complex between 2-(2′-pyridyl)indoles and amide-containing guests leads to quenching of the host fluorescence which provides a direct and sensitive probe of binding.
R. P. Thummel, C. Hung, T. Höpfner and J. Russel, J. Chem. Soc., Chem. Commun., 1994, 857 DOI: 10.1039/C39940000857
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