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7-羟基喹啉(7-HQ)是一种具有激发态质子转移(ESPT)效应的有机分子。它溶于乙醇溶剂中,在紫外光的激励下,将发生ESPT反应,荧光光谱出现2个荧光带。7-HQ溶于二甲基亚砜(DMS)溶剂中,则不能发生ESPT反应,其荧光光谱只出现单一荧光带。但样品被强紫外光照射后,其荧光光谱也出现2个荧光带。文章首次报道了这一现象,并通过对7-HQ的乙醇、二甲基亚砜和二甲基甲酰胺溶液的吸收光谱和荧光光谱的研究,探讨产生这一现象的机理。认为7-HQ溶于DMS中被强紫外光照射后荧光光谱的变化是由于DMS被光解并生成水而使7-HQ发生ESPT反应的结果。 相似文献
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All-optical switching and nonlinear optical properties of HBT in ethanol solution 总被引:1,自引:0,他引:1 下载免费PDF全文
This paper demonstrates an all-optical switching
model system comprising a single pulsed pump beam
at 355 nm and a CW He--Ne signal beam at 632.8 nm with 2-(2^\prime
-hydroxyphenyl)benzothiazole (HBT) in ethanol solution. The origins
of the optical switching effect were discussed. By the study of
nonlinear optical properties for HBT in ethanol solvent, this paper
verified that the excited-state intramolecular proton transfer
(ESIPT) effect of HBT and the thermal effect of solvent worked on
quite different time scales and together induced the change of the
refractive index of HBT solution, leading to the signal beam
deflection. The results indicated that the HBT molecule could be an
excellent candidate for high-speed and high-sensitive optical
switching devices. 相似文献
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