苯并噁唑类化合物荧光光谱的研究

A Study on the Fluorescence Spectra of Benzoxazolyl-Substitutcd Compounds

研究了38种苯并噁唑系列化合物的紫外吸收光谱、荧光发射光谱和荧光量子产率。计算了第一激发单线态辐射和非辐射寿命。结果表明,在苯并(口恶)唑基的苯环上非极性基团取代对辐射和非辐射速率影响不大,但极性基团取代后影响较大。

Absorption spectra, emission spectra and fluorescence yield were measured for thirty-eihgt benzoxazolyl-substituted compounds. From the data radiative and nonradiative lifetimes of the first-excited singlet state were calculated. It is found that the influence of nonpolar substituted groups of the benzoxazolyl on the radiative and nonradiative rates is unremarkable, whereas the influence of polar substituted groups is remarkable. In phenyl compounds, benzoxazolyl groups enhance fluorescence by increasing the rate of the radiative. In vinyl compound benzoxazolyl decrease the rate of nonradiative deactivation. This phenomena is connected with the configuration change which occurs in.photo-excitation process.