Oxonol染料的稳态光物理行为研究

Study on the Steady State Photo-physical Behaviors of Oxonol Dye

对oxonol——一种带负电荷类菁染料化合物溶液的光谱和光物理问题进行了研究。发现它和一般分子内共轭的电荷转移化合物相比,无论在吸收光谱或荧光发射光谱上,都表现出不同的光物理和光化学行为。对出现的这种差异,特别是负的溶致变色行为和在不同pH条件下分子的互变异构等对吸收光谱的影响进行了讨论。

The electronic spectra and photo-physical behaviors of oxonol compound which is a cynine-like dye with negative charge in solution have been studied. It was found that evident difference was observed for the absorption spectra of this compound when it was dissolved in protic and in aprotic solvents respectively. It could be considered as the neutralization of this compound in non-polar solvent and the change of the whole molecular conjugation of oxonol. As compared with usual intra-molecular conjugated charge transfer compounds different behaviors were observed either for absorption spectrum or for fluorescence spectrum of this compound. All of this differences for spectra, especially the behavior of negative solvato-chromism in polar solvents, and the effect of pH value on the tautomerization of compound have been discussed in detail.