共面二叶卟啉铁(III)锌(II)配合物的皮秒光化学：模拟细胞色素 c 与光合细菌反应中心的初始电子供体之间的电子转移。
Picosecond photochemistry of a cofacial diporphyrin containing iron(III) and zinc(II): Mimicking electron transfer between cytochrome c and the primary electron donor in reaction centers of photosynthetic bacteria.
机构信息
Department of Energy and Environment, Brookhaven National Laboratory, Upton, New York 11973.
出版信息
Proc Natl Acad Sci U S A. 1982 Jan;79(2):413-7. doi: 10.1073/pnas.79.2.413.
Abstract
Comparison of picosecond kinetic and spectroscopic data for Zn octaethylporphine and Fe(III)Cl octaethylporphine with that for Zn-Fe(III)Cl, a cofacial diporphyrin composed of a Zn porphyrin covalently bound to an Fe(III)Cl porphyrin with two chains of five atoms each, supports the assignment of a light-driven electron transfer (k > 10(11)s(-1)) within Zn-Fe(III)Cl to form [Zn(+).-Fe(II)]Cl. The kinetics (k approximately 10(10)s(-1)) and thermodynamics of the reverse electron transfer are compared to those of a similar electron transfer in bacterial photosynthesis, the reduction of an oxidized bacteriochlorophyll dimer, (BChl)(2) (+)., by Fe(II) cytochrome c.
摘要
锌卟啉和三氯化铁卟啉的皮秒动力学和光谱数据与共面双卟啉 Zn-Fe(III)Cl 的比较，后者由一个共价连接的 Zn 卟啉和一个 Fe(III)Cl 卟啉组成，每个卟啉都有两条由五个原子组成的链，支持在 Zn-Fe(III)Cl 内光驱动电子转移（k > 10(11)s(-1))的分配，形成[Zn(+).-Fe(II)]Cl。电子反向转移的动力学（k 约为 10(10)s(-1)）和热力学与细菌光合作用中类似的电子转移进行比较，即 Fe(II)细胞色素 c 还原氧化的细菌叶绿素二聚体 (BChl)(2) (+).。
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