Characterization of the Excited States of Indigo Derivatives in their Reduced Forms
作者:Raquel Rondão、J. Sérgio Seixas de Melo、Gundula Voss
DOI:10.1002/cphc.201000082
日期:2010.4.16
A comprehensive characterization of the electronic spectral and photophysical properties of the leuco (reduced) form of several indigo derivatives, including indigo and Tyrian Purple, with di‐, tetra‐, and hexa‐substitution, was obtained in solution. The characterization involves absorption, fluorescence, and triplet–triplet absorption spectra, together with quantitative measurements of quantum yields
在溶液中获得了几种靛蓝衍生物(包括靛蓝和Tyrian Purple)的无色(还原)形式的无色(还原)形式的电子光谱和光物理性质的综合表征。表征涉及吸收,荧光和三重态-三重态吸收光谱,以及荧光量子产率的定量测量, ϕ F(0.46-0.04),系统间交叉, ϕ T(0.013-0.034),内部转化, ϕ IC和相应的寿命。取代的位置和程度促进了所研究的无色衍生物显示的光谱和光物理性质的差异。该φ ˚F该值比先前从相应的酮形式获得的值高约两个数量级。同样,与酮形式的行为相反,S 1 ~~ T 1系统间穿越是激发态失活通道的有效途径。这些发现加强了这样一个事实,与内部转化主导激发态失活的酮靛蓝和无色靛蓝(及其衍生物)相反,激发态失活涉及内部转化,三重态形成和荧光之间的竞争。对甘油中一种化合物的时间分辨研究表明存在光异构化过程。