Experimental and Computational Investigation of Unsymmetrical Cyanine Dyes: Understanding Torsionally Responsive Fluorogenic Dyes
作者:Gloria L. Silva、Volkan Ediz、David Yaron、Bruce A. Armitage
DOI:10.1021/ja070025z
日期:2007.5.1
restricted environments. Herein we describe a series of fluorinated analogues of the dye thiazole orange that exhibit improved fluorescence quantum yields and photostabilities. In addition, computational studies on these dyes revealed that twisting about the monomethine bridge beyond an interplanar angle of 60 degrees leads to a dark state that decays nonradiatively to the ground state, accounting
不对称花青染料由于其发荧光行为而广泛用于生物分子检测,由此荧光量子产率在流体溶液中可能非常低,但在构象受限的环境中显着增强。在此,我们描述了一系列染料噻唑橙的氟化类似物,它们表现出改进的荧光量子产率和光稳定性。此外,对这些染料的计算研究表明,围绕单甲炔桥扭曲超过 60 度的晶面角会导致暗态,该暗态以非辐射方式衰减到基态,从而解释了观察到的荧光行为。氟取代基的位置和数量的影响与观察到的量子产率和计算的扭曲超过该临界角的活化能相关。