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1980 (1)
1Author    Günter LazarRequires cookie*
 Title    Light-Induced Valence Change of a Manganese-Containing Chlorophyll Derivative  
 Abstract    K3(Mn-(III)-chlorin e6) acetate, a water-soluble chlorophyll derivative with manganese as central atom was prepared. The influence o f reducing agents, light, and bicarbonate on the oxida­ tion states of manganese in the chlorin complex was investigated. In alkaline solutions the central Mn3+ was reducible to Mn2+. The illumination of the partially reduced complex first accelerated the reduction (light reduction: Mn3+ -> Mn2+), which was then followed by a strong reoxidation (light oxidation: Mn2+ -* Mn3+) continuing after switching off the light. This redox effect o f light was obtained only in presence o f hydroxylamine as reducing agent. Illumination time, intensity, and frequency had an influence on this effect. In the light/dark change the process was reversible. In regard to the requirement of manganese for the photosynthetic oxygen evolution the observed valence change o f manganese in the chlorin complex was compared to the supposed reaction mechanism on the donor side o f photosystem II. 
  Reference    Z. Naturforsch. 35c, 470—476 (1980); received December 17 1979/March 19 1980 
  Published    1980 
  Keywords    Mn-(III)-chlorin, Photosynthesis, Photoreduction, Photooxidation, Hydroxylamine 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0470.pdf 
 Identifier    ZNC-1980-35c-0470 
 Volume    35