title: Benzothiadiazole oligoene fatty acids: fluorescent dyes with large Stokes shifts.
abstract: Herein, we report on the synthesis and characterization of novel fluorescent fatty acids with large Stokes shifts. Three examples consisting of the same number of carbon atoms and thus of similar chain length are presented differing in their degree of unsaturation. As major fluorogenic contributor at the terminus benzo[c][1,2,5]thiadiazole was used. Respective syntheses based on Wittig reactions followed by iodine-mediated isomerization are presented. The absorption properties are modulated by the number of conjugated C=C double bonds of the oligoene chain ranging from one to three. Large Stokes shifts of about 4900-5700 cm-1and fluorescence quantum yields of up to 0.44 were observed.
authors.affiliation: Institut für Organische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany.
authors.forename: Lukas J
authors.initials: LJ
authors.lastname: Patalag
authors.affiliation: Institut für Organische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Werz
keywords: Stokes shift; fatty acid; fluorescence; lipid; membrane