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 | Zendy

Ichiro Fujita | Zendy; Thomas L. Netzel | Zendy; Chi K. Chang | Zendy; C.-B. Wang | Zendy

Open Access

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

Author(s) -

Ichiro Fujita,

Thomas L. Netzel,

Chi K. Chang,

C.-B. Wang

Publication year - 1982

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.79.2.413

Subject(s) - chemistry , electron transfer , photochemistry , bacteriochlorophyll , porphyrin , p700 , photosynthetic reaction centre , zinc , picosecond , cytochrome , kinetics , dimer , covalent bond , crystallography , photosynthesis , photosystem i , photosystem ii , organic chemistry , laser , biochemistry , physics , quantum mechanics , optics , enzyme

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 > 1011 s -1 ) within Zn—Fe(III)Cl to form [Zn+ ·—Fe(II)]Cl. The kinetics (k ≈ 1010 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) cytochromec .

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