dependence of the CIEEL efficiencies for the para- and meta-substituted spiroadamantyl dioxetanes 1 has been observed, which implies that an electron-transfer mechanism operates through solvent-caged species for both regioisomers. The pronounced difference in the chemiexcitation yields for the meta- and para-substituted dioxetanes is rationalized in terms of the much larger (ca. 200-fold) rate constant for the
已观察到对位和间位取代的螺
金刚烷基二氧杂
环丁烷1的CIEEL效率具有相似的粘度依赖性,这意味着电子传递机理通过两种区域异构体的溶剂笼装物种起作用。对于间位取代和对位取代的二氧杂
环丁烷,在
化学激发产率上的显着差异是根据电子反向转移(BET)步骤提供的更大的(约为200倍)速率常数来合理化的,以提供激发的间位CIEEL发射体。对对位和间位对位异构体的激发态产生的粘度效应的深入动力学分析支持了这一结论。