Photophysical and photochemical properties of naphthalenes substituted with trimethylsilylethynyl, tert-butylethynyl, and trimethylsilylbutadiynyl groups were investigated by measurement of fluorescence yields, lifetimes, and triplet absorption. Introducing trimethylsilylethynyl and tert-butylethynyl groups to the 1-position of the naphthalene skeleton substantially enhanced fluorescence and intersystem crossing (ISC). The rates of fluorescence of 2-substituted naphthalenes were low. The effect of ethynyl groups on the 1-substituted naphthalenes was rationalized in terms of an increase of the transition moment along the short axis of the naphthalene skeleton. Substitution of the trimethylsilylbutadiynyl group at the 1 or 2-position of the naphthalene skeleton caused a considerable decrease in the fluorescence yield (approximately 0.01) and an increase in the ISC yield (0.99).
用三甲基
硅基
乙炔、叔丁基
乙炔和三甲基
硅基
丁二炔基取代的
萘的光物理和光
化学性质通过测量荧光产率、寿命和三重态吸收进行研究。在
萘骨架的1位引入三甲基
硅基
乙炔和叔丁基
乙炔基团显著增强了荧光和内部转换(ISC)。2位取代的
萘的荧光速率较低。
乙炔基团对1位取代
萘的影响可以通过
萘骨架短轴上的跃迁矩增加来解释。在
萘骨架的1位或2位替代三甲基
硅基
丁二炔基团导致荧光产率显著降低(约为0.01),而ISC产率增加(0.99)。