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New fluorescent benzimidazolium-based receptors selectively display the effective fluorescence quenching effect for biologically important anions, GTP and I, in aqueous solution of physiological pH 7.4. These affinities can be attributed to the strong ionic H-bonding along with additional interactions of fluorophore moieties with the nucleic base of GTP and I.

Graphical abstract: Selective detection of guanosine-5′-triphosphate and iodide by fluorescent benzimidazolium-based cyclophanes

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