Photochromism and solvatochromism of push–pull or pull–push spiroindolinenaphthoxazines
作者:A. V. Metelitsa、V. Lokshin、J. C. Micheau、A. Samat、R. Guglielmetti、V. I. Minkin
DOI:10.1039/b204603b
日期:——
The photochromic and solvatochromic behaviour of 17 variously substituted spiroindoline naphthoxazines has been investigated in cyclohexane, toluene, acetonitrile and methanol in fluid solution. Specific parameters such as the wavelengths and the molar absorption coefficients of the closed spiro- and open merocyanine forms, together with the photocoloration and photobleaching quantum yields, rate constants and activation energies of thermal fading have been determined under continuous monochromatic irradiation. It has been shown that most of these parameters are closely related to the electron distribution on the highly conjugated photomerocyanines and on their quinoidal or zwitterionic character. Depending on the acceptor or donor properties and on the position of their substituents, three classes of compounds have been detected.
研究了 17 种不同取代形式的螺吲哚啉萘噁嗪在环己烷、甲苯、乙腈和甲醇的流体溶液中的光致变色和溶致变色行为。在连续单色辐照条件下,确定了封闭螺吲哚菁和开放美拉德菁形式的波长和摩尔吸收系数等具体参数,以及光变色和光漂白量子产率、热褪色速率常数和活化能。结果表明,这些参数大多与高度共轭的光致花青素上的电子分布以及它们的类醌或齐聚物特性密切相关。根据受体或供体的特性及其取代基的位置,可以检测到三类化合物。