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Bicolour fluorescent molecular sensors for cations: design and experimental validation

2021; Royal Society of Chemistry; Volume: 23; Issue: 29 Linguagem: Inglês

10.1039/d1cp01203g

1463-9084

Zoraida Freixa, Iván Rivilla, F. Monrabal, J.J. Gómez-Cadenas, Fernando P. Cossío,

Electrochemical Analysis and Applications

Molecular entities whose fluorescence spectra are different when they bind metal cations are termed bicolour fluorescent molecular sensors. The basic design criteria of this kind of compound are presented and the different fluorescent responses are discussed in terms of their chemical behaviour and electronic features. These latter elements include intramolecular charge transfer (ICT), formation of intramolecular and intermolecular excimer/exciplex complexes and Förster resonance energy transfer (FRET). Changes in the electronic properties of the fluorophore based on the decoupling between its constitutive units upon metal binding are also discussed. The possibility of generating fluorescent bicolour indicators that can capture metal cations in the gas phase and at solid-gas interfaces is also discussed.