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为了改善竹红菌素的红光吸收特性和亲水性 ,合成了一系列竹红菌乙素的衍生物 .利用顺磁共振 (EPR)和吸收光谱法研究了竹红菌乙素衍生物在缺氧条件下的光化学反应 .在光照下 ,所有衍生物都能通过自身电子转移反应生成半醌负离子自由基 ,生成效率和谱图精细结构与衍生物的结构有关 .在电子给体存在时 ,由电子给体向竹红菌乙素衍生物的电子转移增强了相应半醌负离子自由基的生成效率 ,而且还可用吸收光谱法检测到负离子自由基和氢醌的生成 .结构修饰对竹红菌乙素衍生物半醌负离子自由基和氢醌的吸收峰位影响很小 ,但对它们的生成效率却有着明显的影响 .
In order to improve the red light absorption characteristics and hydrophilicity of hypocrellin, a series of derivatives of hypocrellin B were synthesized. The hypothalcin B derivatives were studied using paramagnetic resonance (EPR) and absorption spectroscopy. Photochemical reactions under anoxic conditions. Under light irradiation, all derivatives can generate semi-anthraquinone anion radicals by self-electron transfer reactions. The production efficiency and the fine structure of the spectra are related to the structure of the derivative. In the presence of electron donors, The electron transfer from the electron donor to the H. erythriorubicin derivative enhances the efficiency of the corresponding semi-anthraquinone negative ion generation, and the generation of negative ion radicals and hydroquinone can also be detected by absorption spectroscopy. The effect of the absorption peaks of the anion radicals and hydroquinones on the semisulphonium derivatives of B is very little, but it has a significant effect on their generation efficiency.