摘要
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。
The flurescent decay dynamics of two kinds 7-aminocoumarin derivative molecu-lars in different solvents was investigated by the time-resolved spectroscopy. The environmental effects on the relaxation of the intramolecular rotation with intramolecular charge transfer excited state (TICT) were studied. The results show that TICT is a nonrediative relaxation channel of the excited state of coumarin molecular with unrigid structure, and it was inflenced by the environmental properties (polarity, viscosity and temperature), we found that the Debye-Stokes-Einstein theory needed modifying to a energy barrier of TICT state which is intramolecular and senvironrnents dependent.
关键词
荧光光谱
溶剂效应
分子
电荷
转动
Time-resolved flurescent spectroscopy
Flurescent lifetime
Solvent effect
TICT
Coumarin
