the bridged derivatives DDS-B15 and DDS-B24 were measured as a function of solvent polarity and temperature. The behavior of DDS and DDS-B15 is interpreted in terms of the intramolecular rotational relaxation around the single bond connecting the dialkylanilino group to the ethylene group (bond 2). The high quantum yield of fluorescence of DDS derivatives is discussed and the activation energy between
测量了4,4'-二甲基
氨基sti(
DDS)和桥联衍
生物DDS-B15和
DDS-B24的光谱和位移,荧光量子产率和寿命,它们是溶剂极性和温度的函数。
DDS和
DDS-B15的行为可通过围绕将二烷基
苯胺基与亚乙基连接的单键周围的分子内旋转弛豫来解释(键2)。讨论了
DDS衍
生物荧光的高量子产率,并估计了
DDS-B24在
乙醚和
乙醇中的发射态(E *)和垂直双键态(P *)之间的活化能。为了试图更深入地了解
DDS的多维光
化学,已经应用了CNDO / S计算。具有大的ICT特性的最低单重态激发态被发现是S对于二甲基
苯胺基基团的垂直扭曲构象(TICT态),在气相中处于4态,但根据溶剂化能,在中等极性溶剂中,它可能已经成为S 1态。