Electron transfer in photoexcited porphyrin quinone cyclophanes

✍ Scribed by David Mauzerall; Jurgen Weiser; Heinz Staab

• Publisher: Elsevier Science
• Year: 1989
• Tongue: French
• Weight: 626 KB
• Volume: 45
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(01)85153-x

✦ Synopsis

SlDD&Y: The'striking,.difference' in'fradtions of fast versus slow components of ,I 8 :'

electron,,transfer of the porphyrin mono: and bis-@none cycl~ophanes~are attributed to':Pn..orbital symmetry effect' between the,porphyrin and the $I$&' Iq+r~d~uaWon l !, ,The efficiency of tQe prJmary reactions of the photoFyn+tic . . process:has prompted,many attempts to duplicate.these electron. tri$ns.fer . . reactionsI.

'2

The determination of the structure of the'bacterial.regction center h'as fueled this effort by.showing several.of the .characteristics responsible for the rapid and ,efficienf primary ,electron trans<fers, which lead to c$arge -separation across the .photosynthetiC membrane.

~. outstanding among these characteristics are the separation, and orientation, of the reacting ..I molecules well beyond their van der Waals radii.