Bis(4â²-dibutylaminostyryl)benzene: Spectroscopic Behavior upon Protonation or Methylation
作者:Anthonyâ
J. Zucchero、Juan Tolosa、Larenâ
M. Tolbert、Uweâ
H.â
F. Bunz
DOI:10.1002/chem.200900608
日期:2009.12.7
UV/Vis absorption and emission of 1,4‐bis(4′‐dibutylaminostyryl)benzene (1) upon protonation with trifluoroacetic acid in dichloromethane and in acetonitrile. We find that 1 does not display significantly dynamic acidity in the excited state, that is, it is not a photoacid. Three protonation states of 1 were investigated, all of which, neutral, singly protonated, and bis‐protonated, are fluorescent. As an
我们研究了在二氯甲烷和乙腈中用三氟乙酸质子化后1,4-双(4'-二丁基氨基苯乙烯基)苯(1)的UV / Vis吸收和发射。我们发现1在激发态下没有显示出明显的动态酸度,也就是说,它不是光酸。研究了1的三个质子化状态,所有状态均为中性,单质子化和双质子化。作为单质子化物种的可分离模型,通过与三氟甲磺酸甲酯反应制备了1的甲基化衍生物。该物种显示出红移的发射,但吸收与未季铵化的亲本相似,1。观察到的所有三个质子化状态均为1的强发射表明1 *的动力学光酸度低或不存在。我们假设激发态的寿命太短而无法进行溶剂重组,因此我们无法对1的质子化形式的热力学光酸度做出陈述。