Photogeneration of singlet oxygen (O-1(2)) and free radicals (Sen(center dot-),O-2(center dot)- by tetra-brominated hypocrellin B derivative
文献类型：期刊论文
| 作者 | Ma, JH; Jiang, LJ |
| 刊名 | FREE RADICAL RESEARCH
 |
| 出版日期 | 2001 |
| 卷号 | 35期号:6页码:767-777 |
| 关键词 | Tetra-brominated Hypocrellin b Semiquinone Anion Radical Superoxide Anion Radical Singlet Oxygen Electron Paramagnetic Resonance |
| ISSN号 | 1071-5762 |
| 英文摘要 | To improve photodynamic activity of the parent hypocrellin B (HB), a tetra-brominated HB derivative (compound 1) was synthesized in high yield. Compared with HB, compound I has enhanced red absorption and high molar extinction coefficients. The photodynamic action of compound 1, especially the generation mechanism and efficiencies of active species (Sens(-), O-2(-) and O-1(2)) were studied using electron paramagnetic resonance (EPR) and spectrophotometric methods. In the deoxygenated DMSO solution of compound 1, the semiquinone anion radical of compound 1 is photogenerated via the self-electron transfer between the excited and ground state species. The presence of electron donor significantly promotes the reduction of compound 1. When oxygen is present, superoxide anion radical (O-2(-)) is formed via the electron transfer from Sens(-) the ground state molecular oxygen. The efficiencies of Sens(-) and O-2(-) generation by compound 1 are about three and two times as much as that of HB, respectively. Singlet oxygen (O-1(2)) can be produced via the energy transfer from triplet compound 1 to ground state oxygen molecules. The quantum yield of singlet oxygen (O-1(2)) is 0.54 in CHCl3 similar to that of HB. Furthermore, it was found that the accumulation of Sens- would replace that of O-2(-) or O-1(2) with the depletion of oxygen in the sealed system. |
| 语种 | 英语 |
| WOS记录号 | WOS:000174639900012 |
| 出版者 | TAYLOR & FRANCIS LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/77847]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Jiang, LJ |
| 作者单位 | Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, JH,Jiang, LJ. Photogeneration of singlet oxygen (O-1(2)) and free radicals (Sen(center dot-),O-2(center dot)- by tetra-brominated hypocrellin B derivative[J]. FREE RADICAL RESEARCH,2001,35(6):767-777. |
| APA | Ma, JH,&Jiang, LJ.(2001).Photogeneration of singlet oxygen (O-1(2)) and free radicals (Sen(center dot-),O-2(center dot)- by tetra-brominated hypocrellin B derivative.FREE RADICAL RESEARCH,35(6),767-777. |
| MLA | Ma, JH,et al."Photogeneration of singlet oxygen (O-1(2)) and free radicals (Sen(center dot-),O-2(center dot)- by tetra-brominated hypocrellin B derivative".FREE RADICAL RESEARCH 35.6(2001):767-777. |
入库方式： OAI收割
来源：化学研究所
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