Residence and diffusion of a dynamically prototropic hydration probe in AOT reverse micelles
作者:Aniruddha Adhikari、Jae-Heon Park、Hak-Won Nho、Oh-Hoon Kwon
DOI:10.1016/j.molliq.2020.114346
日期:2020.12
We investigated the hydration dynamics in the nanosized water pool of an Aerosol-OT (AOT) reverse micelle (RM) using a prototropic (proton-donating) fluorescent dye, N-methyl-7-hydroxyquinolinium (NM7HQ+), as the probe. NM7HQ+ is a photoacid, and the deprotonation of its excited-state cationic form (C*) gives rise to a neutral keto species (K*). In the present study, the residence sites of C* and K*
我们研究了质子传递给质子的荧光染料N-甲基-7-羟基喹啉(NM7HQ +)作为探针在气溶胶-OT(AOT)反胶束(RM)的纳米级水池中的水合动力学。NM7HQ +是一种光酸,其激发态阳离子形式(C *)的去质子化反应生成中性的酮类(K *)。在本研究中,通过监测其时间分辨的荧光各向异性来确定C *和K *在各种大小的水池中的驻留位点。此外,通过将光谱拟合为两个对数正态峰函数的和,分析了时间分辨荧光光谱中C *和K *谱带的演化。具有不同形式电荷的物质的随时间变化的光谱位移揭示了阴离子AOT头基与结合水区域的界面处的特征水合作用,以及探针在RM中的旋转和平移扩散。