PHOTOCHEMICAL GENERATION OF BACTERIOCHLOROPHYLL-B CATION-RADICAL AND ANION-RADICALS OF BACTERIOCHLOROPHYLL-B, BACTERIOPHEOPHITIN-B OF PHOTOSYNTHETIC BACTERIA RHODOPSEUDOMONAS-VIRIDIS

Abstract

The mechanism of photochemical redox reaction of bacteriochlorophyll b and bacteriopheophytin b was studied. The oxidation of bacteriochlorophyll b was carried out in ethanol by p-benzoquinone. In ESR spectra the singlet line with .DELTA.H = 8.4 gs and g = 2.0025 corresponded to cation-radical. The changes within the region of 400-500 nm, 500-600 nm and the band with the maximum at 685 nm corresponded to cation-radical in the absorption spectra. Anion-radicals of bacteriochlorophyll b and bacteriopheophytin b observed in the ESR spectra had singlet form with weak and super thin structure and corresponded with .DELTA.H = 10 gs, .DELTA.H = 12 gs. The spectrophotometric characteristics of the above pigments were obtained.