ELECTRON-TRANSFER FROM PHOTOEXCITED SINGLET AND TRIPLET BACTERIOPHEOPHYTIN
ELECTRON-TRANSFER FROM PHOTOEXCITED SINGLET AND TRIPLET BACTERIOPHEOPHYTIN
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DOI：
10.1111/j.1751-1097.1976.tb07275.x
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发表时间：
1976-01-01
影响因子：
3.3
通讯作者：
ROCKLEY, MG
中科院分区：
文献类型：
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作者：
HOLTEN, D;GOUTERMAN, M;ROCKLEY, MG
利用纳秒和皮秒动力学技术[采用红宝石激光系统]研究了[红球藻]细菌表藻素的第一激发单重态（Bph*）和第一激发三重态（BphT）与对苯醌的电子转移。用40 mM对苯醌猝灭Bph* 导致Bph* 寿命的降低，但不直接导致π-β-环的形成。阳离子自由基 **图形 **。在8 M碘甲烷和40 mM对苯醌的存在下，单重态寿命进一步降低，但由于Bph* 和BphT之间的系统间交叉速率增加，BphT的量子产率提高。从BphT到对苯醌的电子转移导致形成和检测。图形 **。结果进行了讨论的自旋选择性的反向电子转移过程中的中间电荷转移复合物。
Nanosecond and picosecond kinetic techniques [employing a ruby laser system] were used to study electron transfer from the 1st excited singlet state (Bph*) and the 1st excited triplet state (BphT) of [Rhodopseudomonas sphaeroides] bacteriophenophytin to p-benzoquinone. Quenching of Bph* by 40 mM p-benzoquinone results in a decrease in the lifetime of Bph* but does not lead directly to the formation of the .pi.-cation radical .**GRAPHIC**. In the presence of both 8 M methyl iodide and 40 mM p-benzoquinone, the singlet lifetime is reduced further, but the quantum yield of BphT is enhanced due to the increased rate of intersystem crossing between Bph* and BphT. Electron transfer from BphT to p-benzoquinone leads to the formation and detection of .**GRAPHIC**. The results are discussed in terms of the spin-selectivity of the reverse electron transfer process within the intermediate charge transfer complexes.