Chemosensors displaying pH controlled multistage fluorescence emission

Fernando Pina, M. João Melo, M. Alexandra Bernardo, Santiago V. Luis, Enrique García-España

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


A large number of systems displaying pH controlled multistages of fluorescence emission intensity, have not been recognized from this point of view. In this work we present two paradigmatic cases: (i) polyamine receptors linked to a fluorophore unit, in which the signal is modulated by an intra-molecular pH dependent electron transfer process, (ii) phenols presenting adiabatic excited state proton transfer. In the first example the chemosensors are constituted by a receptor unit containing a polyaza moiety suitable for binding protons (but also metal ions or anions). The receptor is linked to a benzene or naphthalene unit that acts as a fluorophore. The fluorescence signal is dependent on the protonation state of the receptor. In the second example, addition of buffers are used to tune the intensity of the fluorescence emission.

Original languageEnglish
Pages (from-to)65-69
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number1-3
Publication statusPublished - 1 Jan 1999


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