关键词: 紫外分光光度法, 量子产额, 激发态, 激发态, 分子轨道理论, 取代基效应, 能量传递, 荧光分光光度法, 二唑 P, 恶唑 P

5-Phenyl-2-(2'-phenyloxazol-5'-yl)-1,3,4-oxadiazole (I) and twelve of its 5-substituted Ph derivatives were synthesized. Their UV and fluorescence spectra, fluorescence quantum yields and laser conversion efficiencies were reported. It is shown that linear relationship exists between the absorption max. of the compounds and Hammett's substituent constants and that the four rings of each compound are more coplanar in S1 than in S0 state.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, QUANTUM YIELDS, EXCITED STATE, EXCITED STATE, MOLECULAR ORBITAL THEORY, SUBSTITUENT EFFECT, ENERGY TRANSFER, FLUOROSPECTROPHOTOMETRY, OXODIAZOLE P