Kwon Oh-Hoon, Jang Du-Jeon
School of Chemistry, Seoul National University, NS60, Seoul 151-742, Korea.
J Phys Chem B. 2005 Nov 3;109(43):20479-84. doi: 10.1021/jp053187v.
The excited-state proton-transfer dynamics of 7-azaindole occurring in the water nanopools of reverse micelles has been investigated by measuring time-resolved fluorescence spectra and kinetics, as well as static absorption and emission spectra, with varying water content and isotope. 7-Azaindole molecules are found to exist in the bound-water regions of reverse micelles. The rate constant and the kinetic isotope effect of proton transfer are smaller than those in bulk water although both increase with the size of the water nanopool. The retardation of proton transfer in the bound regions is attributed to the increased free energy of prerequisite solvation to form a cyclically H-bonded 1:1 7-azaindole/water complex.
通过测量时间分辨荧光光谱和动力学以及静态吸收和发射光谱，研究了在反胶束水纳米池中7-氮杂吲哚的激发态质子转移动力学，其中水含量和同位素各不相同。发现7-氮杂吲哚分子存在于反胶束的结合水区域。质子转移的速率常数和动力学同位素效应均小于本体水中的相应值，尽管二者均随水纳米池尺寸的增大而增加。结合区域中质子转移的延迟归因于形成环状氢键1:1 7-氮杂吲哚/水络合物所需溶剂化自由能的增加。
