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ABSORPTION CHANGES IN THE REACTION CENTER OF PHOTOSYNTHETIC BACTERIA AND n‐ELECTRON CALCULATIONS ON BACTERIOCHLOROPHYLL, ITS MONO CATION AND ANION
Author(s) -
OTTEN H. A.
Publication year - 1971
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1971.tb06198.x
Subject(s) - bacteriochlorophyll , photosynthetic reaction centre , chemistry , ion , absorption (acoustics) , pyrrole , photochemistry , absorption band , purple bacteria , electron , ring (chemistry) , molecule , electron transfer , photosynthesis , physics , organic chemistry , optics , biochemistry , quantum mechanics
— π‐Electron calculations of the MO‐SCF‐CI type in the PPP approximations are carried out for the tetra pyrrole ring of the bacteriochlorophyll molecule, its mono cation and anion. According to the calculations the formation of the positive ion will be accompanied by the disappearance of the longest wavelength absorption band of the neutral system and the appearance of a new band near 1200 nm. Absorption changes of the same kind are found in the reaction center of photosynthetic bacteria upon illumination, supporting the hypothesis that the primary reaction is an expulsion of an electron from the π‐electron system of the reaction center bacteriochlorophyll.