Excited-State Photophysics of Hypericin and Its Hexamethoxy Analog: Intramolecular Proton Transfer as a Nonradiative Process in Hypericin
作者:D. S. English、W. Zhang、G. A. Kraus、J. W. Petrich
DOI:10.1021/ja962476h
日期:1997.4.1
The excited-state photophysics of the light induced antiviral agent, hypericin, are compared with those of its methylated analog, hexamethoxyhypericin. This comparison is instructive in understanding both the ground- and the excited-state properties of hypericin. That the hexamethoxy analog has no labile protons that can be transferred, that it cannot protonate its own carbonyl groups, that it has
将光诱导抗病毒剂金丝桃素的激发态光物理学与其甲基化类似物六甲氧基金丝桃素的激发态光物理学进行比较。这种比较有助于理解金丝桃素的基态和激发态特性。六甲氧基类似物没有可以转移的不稳定质子,它不能质子化它自己的羰基,它相对于金丝桃素具有降低的荧光量子产率和寿命,并且它没有表现出受激发射,或者更具体地说,上升受激发射的时间完全支持我们新兴的金丝桃素光物理学模型。结果与金丝桃素中存在分子内激发态质子转移一致,但在其甲基化类似物中不存在。