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测定了四种苯并恶唑类化合物在17种溶剂中的紫外吸收和荧光发射光谱,用五种方法对絮外吸收光谱和Stokes位移的溶剂效应进行了关联。结果表明:Nicol关系式能很好地描述溶剂对溶质分子的紫外吸收峰值的位移效应。利用Lippert方程还计算了这四个化合物在第一激发单线态的偶极矩。
The UV absorption and fluorescence emission spectra of four benzoxazoles in 17 solvents were determined. Five methods were used to correlate the UV absorption spectra and the solvent effects of Stokes shift. The results show that the Nicol relation can well describe the displacement effect of the solvent on the peak of ultraviolet absorption of solute molecules. The dipole moments of these four compounds at the first excited singlet state have also been calculated using the Lippert equation.