【摘要】 <正> 前文报道了合成一系列1,3-双-β-萘基丙烷的衍生物C₁₀H₇CHXCH₂CH₂C₁₀H₇,在次甲基链的第一位碳原子上分别引入OH、OAc及Cl等基团,并测定了它们的荧光光谱。从荧光光谱的结果可以看出,它们都能形成分子内激基缔合物（excimer）。最近,我们又合成了CN取代的衍生物,测定了这一系列双-β-萘基丙烷衍生物的低温荧光光谱,并计算出它们形成分子内激基缔合物所需之活化能。由于在溶液中激基缔合物的形成是扩散控制过程,在低温条件下升高温度将有利于激基缔合物的形成。更多还原

【Abstract】 In addition to a series of bis-β-naphthyl alkanes 1-cyano-1, 3-bis-β-naphthylalkane has been synthesized and their fluorescence spectra have been studied overthe temperature range-196 to -10℃. The activation energies required for theirintramolecular excimer formation have been calculated. It is indicated that inthe low temperature region, the intramolecular excimer formation is an activatedprocess. In the case of substituted bis-β-naphthyl alkanes, by introducing electron-attracting groups in the side chain, the electron densities of the two naphthalenenuclei become unequal. The exparimental results suggest that in the process ofintramolecular excimer formation there exists a charge transfer intermediate state.As the result, differences in the electronagativities of the substituted groups andsolvent polarities may give different influences on the activation energies requiredfor the excimer formation. In solution, the excimer formation is diffusion-controlled. In the low temparatureregion, raising temperature favors the excimer formation.更多还原