China Shenhua Coal to Liquid and Chemical Shanghai Research Institute, Shanghai, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Mar;88:111-5. doi: 10.1016/j.saa.2011.12.009. Epub 2011 Dec 10.
The aqueous solutions of lower alcohols such as methanol, ethanol, 1-propanol and 2-propanol, were studied by fluorescence spectroscopy of pyrene, defining the Py scale for polarity. Sigmoidal curves were used to fit the Py values of aqueous alcohol solutions as a function of the logarithm of water-alcohol mole ratio, i.e., log(WAR). The results from curve fittings were discussed in terms of the structural transitions of aqueous alcohol solutions, as well as the dissociation constants for alcohol- and water-pyrene complexes. The microscopic alcohol and water phases were considered to be saturated with each other, and the structures of dilute aqueous alcohol solutions were found to be more complicated than those of concentrated ones.
研究了甲醇、乙醇、1-丙醇和 2-丙醇等低级醇在水溶液中的荧光光谱，通过芘的荧光光谱定义了极性标度（Py 标度）。采用 Sigmoidal 曲线拟合水醇摩尔比（WAR）的对数与水醇溶液中芘值之间的关系。通过曲线拟合结果讨论了水醇溶液的结构转变以及醇-和水-芘络合物的离解常数。考虑到微观醇相和水相彼此饱和，发现稀水溶液的结构比浓溶液更复杂。
