摘要
不同的双－（ｐ－Ｎ，Ｎ－二甲氨基苄叉）酮ＤＭＢＫ和二苯基碘盐（ＤＰＩＯＦ）复合，组成一种新型的电子转移光显色体系，ＤＭＢＫ／ＤＰＩＯＦ复合体系在暗处有良好的热稳定性。在光作用下很快发生从激发态ＤＭＢＫ至ＤＰＩＯＦ的电子转移，并伴随ＤＭＢＫ染料的褪色，测得ＤＭＢＫ光褪色速度的次序为：ＤＭＢＡ＞ＤＭＢＰ＞ＤＭＢＨ。与此同时，电子转移又引起新的光显色反应，对ＤＭＢＡ化合物，在７００ｎｍ处出现新吸收峰。其光密度随光照时间而增长，然而，ＤＭＢＰ和ＤＭＢＨ体系这种光显色现象并未观察到，这可能由于它们的中间产物不能共平面的缘故，ＤＭＢＡ的光显色速度和最大密度明显取决于浓度和溶剂性质。本文对这种短波区光褪色和长波区光显色的光化学反应过程作了讨论。
Different bis(p-N,N-dimethylamino)benzylidene ketones DMBK(DMBA、DMBPand DMBH)were used as a new kind of photoinduced electron transfer photocolorationsystem by combination with diphenyliodonium salt.The DMBK/DPIOF combination system exhibites a good thermal stability in darkand rapidly undergoes electron transfer from excited DMBK to DPIOF under irradiationwith photofading of DMBK dye. The photofading rate for different DMBK was determinedin the order:DMBA>DMBP>DMBH.The electron transfer induced photocoloration withmaximum absorption peak at 700 nm was observed only in the case of DMBK and optical density increaJses with incresaing irradiation time.But it could not be observed inthe DMBP and DMBH probably due to the formation of non-coplane intermediates.Thephotocoloration rate and maximum density of DMBA depend considerably on the concentration and nature of solvents.The photoreaction processes of electron transfer photofadingat short wavelength range and photooloration at long wavelength range were preliminarydiscussed.
出处
《感光科学与光化学》
CSCD
1994年第3期229-234,共6页
Photographic Science and Photochemistry
基金
国家自然科学基金
关键词
光显色
双酮
碘Wong盐
KMBK
DPIOF
electron transfer,photocoloration,bis(p-N,N-dimethylamino)benzylidene,ketones/iodonium salt system.To whom correspondence should be addressed.
