title: Acid-Responsive Absorption and Emission of 5-N-Arylaminothiazoles: Emission of White Light from a Single Fluorescent Dye and a Lewis Acid.
abstract: Solutions of 5-N-arylaminothiazoles containing pyridyl groups exhibited clear halochromism and halofluorism upon addition of Brønsted and Lewis acids. The addition of triflic acid to solutions of 5-N-arylaminothiazoles in Et2O induced bathochromic shifts of the absorption and emission bands. DFT calculations suggested that the spectral changes arise from the protonation of the pyridyl group of the thiazoles in Et2O. Single-crystal X-ray diffraction analysis of a thiazole and its protonated form revealed the change of the conformation around the thiazole ring. The emission of white light was accomplished from a single fluorescent dye by adjusting the ratio of dye and B(C6F5)3, whereby the International Commission on Illumination coordinates showed a linear change from blue to orange.
authors: Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University, Yanagido Gifu 501-1193 Japan.
authors: Kirara
authors: K
authors: Yamaguchi
authors: Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University, Yanagido Gifu 501-1193 Japan.
authors: Toshiaki
authors: T
authors: Murai
authors: Institute for Chemical Research Kyoto University, Gokasho Uji Kyoto 611-0011 Japan.
authors: Jing-Dong
authors: JD
authors: Guo
authors: Institute for Chemical Research Kyoto University, Gokasho Uji Kyoto 611-0011 Japan.
authors: Takahiro
authors: T
authors: Sasamori
authors: Institute for Chemical Research Kyoto University, Gokasho Uji Kyoto 611-0011 Japan.
authors: Norihiro
authors: N
authors: Tokitoh
keywords: 5-aminothiazoles; Lewis acids and bases; absorption; fluorescent dyes; white-light emission