新型光敏剂竹红菌甲素的强激光效应及电子激发态特性

有机功能分子在开发新型光电子材料和光动力疗法(PDT)光敏剂方面是一个重要的研究热点;竹红菌甲素(HA)分子属于激发态质子转移(ESIPT)型分子,具有丰富的激发态特性,且反应速度快,在新型激光染料和新型光电器件方面有一定的应用前景。观察了竹红菌甲素分子的激射现象,其发射激光的范围在620~800 nm;并利用激射效应的特点为强激光条件下的质子转移提供了进一步的依据。利用瞬态光栅技术研究了竹红菌甲素的电子激发态特性,把其瞬态光栅的超快过程归结为竹红菌甲素质子转移形成的过渡态TS*的衰减,并得出过渡态TS*瞬态光栅的寿命为10.5 ps。

Intense Laser Effect and Excited State Properties of a New-Type Photosensitizer Hypocrellin A

At present, functional organic molecule is a study focus in exploitation of new type photoelectron material and photosensitizer of photodynamic therapy (PDT), therefore it is necessary to study a new-type photosensitizer hypocrellin A (HA) which belongs to excited state intramolecule proton transfer (ESIPT) molecule, that is, HA′s basic properties of spectroscopy and electronic excited state properties. As a result, the stimulative phenomenon of HA is found, the rage of laser emission is 620～800 nm, providing a new proof for ESIPT under intense excitation. The fast process of HA′s excited state is investigated by transient grating technology, it is believed to be a result from the decay of transitional state (TS*) produced by skeleton rearrangement. Its lifespan is 10.5 ps.