罗丹明6G在醇溶液中的荧光频移特性分析

Analysis of Fluorescence Frequency Shift of Rhodamine 6G in Alcohol Solution

罗丹明6G在甲醇、乙醇、乙二醇溶液中均发出较强的荧光。当醇溶液浓度为33.3%时,基本不存在频移现象。当醇溶液浓度为99.7%时,荧光峰发生蓝移或红移,分析认为该频移是由罗丹明6G和醇类物质分子相互作用(如氢键、静电吸引)导致激发态能量升高、荧光峰蓝移,与醇类物质分子中羟基OH的孤对电子跃迁导致荧光能量降低、荧光峰红移,这两种因素相互竞争的结果,且在高浓度醇溶液中,羟基OH数量越多,红移越明显。

Rhodamine 6G in methanol, ethanol,ethylene glycol solution are all issue a strong fluorescence. When the concentration of alcohol is 33.3%,there is no frequency shilt,when alcohol concentration is 99.7% and fluorescence summit occurs redshilt or blueshilt.The analysis shows that the frequency shift is composed of Rhodamine 6G and alcohols interactions （ such as hydrogen bonding, electrostatic attraction） lead to excited state energy increased and thus fluorescence peak occurs blueshift, and alcohols in the hydroxyl OH solitary on the electron transition leads to lower fluorescence energy, and thus fluorescence peak occurs redshift, and in high concentration alcohol solution,the more the hydroxyl OH,the redshift more obvious.