Naphthalimide-Based Fluorescent Dyes: Impact of Extension of π-Conjugation and Introduction of an Electron-Donating Moiety on the Photophysical Properties
作者:Joe Otsuki、Minori Yamano、Tae Yamano、Kosuke Sugawa
DOI:10.1246/bcsj.20180151
日期:2018.10.15
Concerning a series of naphthalimide-based fluorescence dyes in which the π-system is extended with oligothiophene units, it has been revealed that the absorption and fluorescence maxima can be tuned over ca. 100 nm and ca. 180 nm range by extending π-conjugation, respectively. The effects of the solvent on the fluorescence quantum yield depend on the conjugation length. For the same series but with an electron-donating moiety (push-pull type dyes), the absorption and fluorescence maxima are less dependent on the conjugation length. The fluorescence quantum yields of the push-pull type dyes are large in toluene (>0.3) but extremely low in DMSO. These results will be a guide for the design of naphthalimide-based sensors and probes.
关于一系列萘啶酰亚胺基荧光染料(其中的 π 系统由低聚噻吩单元扩展),研究发现,通过扩展 π 共轭,可分别在约 100 nm 和约 180 nm 的范围内调整吸收和荧光最大值。π-共轭的范围分别为 100 nm 和 180 nm。溶剂对荧光量子产率的影响取决于共轭长度。对于同一系列但具有电子供体的染料(推挽型染料),吸收和荧光最大值对共轭长度的依赖性较小。推挽型染料在甲苯中的荧光量子产率很大(大于 0.3),但在二甲基亚砜中则极低。这些结果将为设计基于萘二甲酰亚胺的传感器和探针提供指导。