Li Hongru, Gao Fang, Asato Alfred E, Liu Robert S H
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 40044, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Jan;69(1):272-7. doi: 10.1016/j.saa.2007.02.024. Epub 2007 Mar 31.
Several azulenic dyes, including six azulene hydrocarbons, two azulene aldehydes, and two olefinic azulenes, have been synthesized to survey their photophysics and photochemistry. These azulenes display S(2)-->S(0) emission, but with several differences. This is the most remarkable characteristic of the effect of orbital control on color and excited state properties of the azulenic compounds. This paper emphasizes how emission spectra and photochemistry of azulenic compounds are influenced by their chemical structure and solvent. The emission spectra of the azulene hydrocarbons suggest that their excited state properties can be controlled by their molecular structure and size. It was confirmed by emission and (1)H NMR spectroscopy that azulene monoaldehyde is protonated in a strong acid, such as trifluoroacetic acid (TFA). Photochemistry of styrylazulenes was observed during irradiation. Azulenic compounds are thermally stable and color tunable, and hence they are good candidates as non-linear optical materials. Based on their unique photochemical and photophysical characteristics, novel azulenic dyes can be constructed for different uses.
已经合成了几种薁类染料，包括六种薁烃、两种薁醛和两种烯烃薁，以研究它们的光物理和光化学性质。这些薁显示出S(2)→S(0)发射，但存在一些差异。这是轨道控制对薁类化合物颜色和激发态性质影响的最显著特征。本文强调了薁类化合物的发射光谱和光化学如何受到其化学结构和溶剂的影响。薁烃的发射光谱表明，它们的激发态性质可以通过其分子结构和大小来控制。通过发射光谱和(1)H NMR光谱证实，薁单醛在强酸如三氟乙酸(TFA)中会发生质子化。在辐照过程中观察到了苯乙烯基薁的光化学性质。薁类化合物热稳定性好且颜色可调，因此它们是很好的非线性光学材料候选物。基于其独特的光化学和光物理特性，可以构建用于不同用途的新型薁类染料。
