A physico-chemical aspect of cyanine dye-cyclomalto-oligosaccharide systems: enhanced dimerization of the dye and shortening of the lifetime of the photoisomer
作者:Kazuo Kasatani、Masafumi Ohashi、Hiroyasu Sato
DOI:10.1016/0008-6215(89)85179-1
日期:1989.10
single-exponential decay, indicating rapid equilibration of the photoisomer included in the CD cavity and that in solution. For each of the dye-CD pairs with enhanced dimerization, the lifetime of the photoisomer is shortened but the reverse does not always obtain. The shortening of the lifetime of the photoisomer involves the monomer dye included in the cavity of the CD.
摘要环麦芽糖肽(βCD)和环麦芽八糖(γCD)增强了某些花青染料在水溶液中的二聚作用。增强的存在与否取决于连接链的长度,链上是否存在大原子以及在每个末端的发色团的大小。这些CD加速了某些花菁染料的光异构体对原始构象异构体的逆反应。光敏异构体的瞬态吸收显示出单指数衰减,表明CD腔中和溶液中的光敏异构体迅速平衡。对于具有增强的二聚作用的每个染料-CD对,光异构体的寿命缩短了,但并非总能获得相反的结果。光异构体寿命的缩短涉及CD腔中包含的单体染料。