乙醇溶液的荧光光谱研究(英文)

Fluorometic Determination of Ethanol Solution

分别从理论和实验上对乙醇水溶液在可见波段产生的荧光光谱及其特性进行了分析研究 结果表明 ,在波长为 2 5 3.7nm的紫外光激励下 ,乙醇溶液可以产生两个较强的荧光峰 ,即 2 78～ 4 93nm和 5 34～6 6 5nm 荧光峰随乙醇溶液浓度的变化而变化 ,但在溶液的高浓度区和低浓度区 ,荧光的变化规律不同 经理论分析认为 ,乙醇在 2 5 3.7nm的激励下发出的荧光是由乙醇分子中C OH基团的孤对电子产生的

The visible fluorescence spectra from ethanol water solution and its characteristics are investigated in experiment and theory. The experimental results indicate that spectral profile of ethanol has two prominent fluorescence regions from 278 nm to 493 nm and from 534 nm to 665 nm when excited by ultraviolet (UV) light (λ max =253.7 nm). The fluorescence spectra change as the concentration of solution alters. However, the change rules of solution with high concentration are different from those with low concentration. Furthermore, the physical mechanisms of fluorescence emission of ethanol water solution induced by UV light are analyzed based on the theory of molecule orbital structure. It is considered that this fluorescence comes from the transition from nonbonding electrons namely n electrons in the hetero atom group (C OH) to the antibonding orbital σ *. Investigation on the fluorescence spectra and its characteristics will contribute to study of other organic macromolecule fluorescence spectra when alcohol serves as solvent.