title: An acridinium-based sensor as a fluorescent photoinduced electron transfer probe for proton detection modulated by anionic micelles.
abstract: A water-soluble fluorescent pH sensor of 9-amino-10-methylacridinium chromophore with the 2-(diethylamine)ethyl chain as a receptor shows an "off-on" response going from basic to acidic solution. Photoinduced electron transfer has been directly demonstrated to be the quenching mechanism by the observation of the long-lived acridinyl radical. The interaction of the protonated sensor with anionic micelles causes a significant increase in the detection sensitivity of pH.
authors.affiliation: Dipartimento di Chimica, Biologia e Biotecnologie and Centro di Eccellenza Materiali Innovativi Nanostrutturati (CEMIN), Università di Perugia, Via Elce di sotto 8, 06123, Perugia, Italy. tiziana.delgiacco@unipg.it.
authors.forename: Stefano
authors.initials: S
authors.lastname: Basili
authors.forename: Tiziana
authors.initials: T
authors.lastname: Del Giacco
authors.forename: Fausto
authors.initials: F
authors.lastname: Elisei
authors.forename: Raimondo
authors.initials: R
authors.lastname: Germani
mesh_terms: D000585:Aminacrine / Q000031:analogs & derivatives* / Q000737:chemistry; D000838:Anions; D004579:Electron Transport; D004583:Electrons; D005456:Fluorescent Dyes / Q000032:analysis / Q000138:chemical synthesis*; D005609:Free Radicals / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D015394:Molecular Structure; D011522:Protons; D012996:Solutions; D014867:Water / Q000737:chemistry*
chemical_list: D000838:Anions; D005456:Fluorescent Dyes; D005609:Free Radicals; D008823:Micelles; D011522:Protons; D012996:Solutions; D014867:Water; D000585:Aminacrine; C026962:9-amino-10-methylacridinium