title: 1,3-Diphenyl-1H-pyrazolo[3,4-b]quinoline: a versatile fluorophore for the design of brightly emissive molecular sensors.
abstract: [structure: see text] The 1,3-diphenyl-1H-pyrazolo[3,4-b]-quinoline chromophore is a versatile building block for the construction of brightly fluorescent molecular sensors. Facile synthetic procedures allow integration of the chromophore into fluorophore-spacer-receptor systems as well as fluoroionophores operating via intramolecular charge transfer. Whereas the former photoinduced electron-transfer probes show strong analyte-induced fluorescence enhancement, the latter exhibit bright ratiometric dual emission. Employing prototype macrocyclic receptors, the favorable signaling features for metal ion recognition are demonstrated.
authors.affiliation: Department I.3902, Federal Institute for Materials Research and Testing (BAM), Richard-Willstaetter Str. 11, D-12489 Berlin, Germany. knut.rurack@bam.de
authors.forename: Knut
authors.initials: K
authors.lastname: Rurack
authors.forename: Andrzej
authors.initials: A
authors.lastname: Danel
authors.forename: Krystyna
authors.initials: K
authors.lastname: Rotkiewicz
authors.forename: Danuta
authors.initials: D
authors.lastname: Grabka
authors.forename: Monika
authors.initials: M
authors.lastname: Spieles
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Rettig