为了对候选光敏剂竹红菌甲素(HA)进行改性并保持其优异的敏化特性,对HA的光谱特性和激发态性质作了进一步的指认。系统研究了HA在不同液相体系下的吸收和荧光光谱,对指认HA的光谱和电子跃迁的机制提出了新的依据,结果表明,吸收带I产生于π-π*跃迁,吸收带Ⅱ和Ⅲ产生于P-π共轭所导致的L→aπ跃迁的电子振动结构;荧光发射带I和Ⅱ是产生于同一跃迁机制S1(L,aπ)→S0的正常荧光的振动结构。 In order to modify the candidate photosensitizer Hypocrellin A (HA) and maintain its excellent sensitization properties, the spectral properties and excited state properties of HA were further identified. The absorption and fluorescence spectra of HA in different liquid systems were systematically investigated. The new mechanism of the recognition of the spectral and electronic transitions of HA was proposed. The results show that the absorption bands I are generated in the π-π * transitions, the absorption bands Ⅱ and Ⅲ results from the electron vibrational structure of L → aπ transition caused by P-π conjugation. Fluorescent emission bands I and II are the normal fluorescence vibrational structures generated by the same transition mechanism S1 (L, aπ) → S0.