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本文采用时间分辨荧光光谱方法,考查了两种7-胺基香豆类素衍生物分子在不同溶剂中的荧光辐射弛豫过程,研究了环境因素对伴随着分子内电荷转移的分子内转动激发态(TICT)弛豫过程的影响。结果说明TICT态是非刚性香豆素分子激发态无辐射弛豫路径之一,这一过程受到环境介质的极性、粘度和温度的影响。并指出了在考虑粘度影响时,须对DSE理论进行修正,同时提出了TICT态存在位垒的观点。
In this paper, time-resolved fluorescence spectroscopy was used to study the fluorescence emission relaxation process of two 7-amine coumarin derivatives in different solvents. The effects of environmental factors on intramolecular rotational excitation with intramolecular charge transfer State (TICT) relaxation process. The results show that the TICT state is one of the non-radiative relaxation pathways of the non-rigid coumarin molecule excited state, which is affected by the polarity, viscosity and temperature of the environmental medium. It is pointed out that the DSE theory needs to be modified when the influence of viscosity is taken into account, and the viewpoint that the barrier exists in the TICT state is proposed.