MANGANESE PORPHYRIN COMPLEXES II-ELECTRONIC SPECTROSCOPY AND STRUCTURE

摘要: In green plant photosynthesis several transition elements are needed for normal function of the chloroplast. One these, manganese, is required oxygen evolution that occurs in photosystem II.1 Several investigations have suggested, on basis photochemical experiments, manganese involved breakdown a primary oxidant which formed photolytic splitting water.2 The nature and detailed description action it still to be determined. It appears there one atom present per 50 chlorophylls photosynthetic unit.3 metal atoms physically located protein portion II.4 difficult remove from chloroplast no physical property (namely, ESR spectra) can observed vivo. ligand binding not known. complex does appear special chlorophyll molecule associated with lipid phase.4 evidence, however, rule out similar contained phase. Recent evidence4 indicates high oxidation state, +3 or +4. Calvin has suggested bound porphyrin-like ligands.5 fact, been demonstrated porphyrin complexes generated + 3 +4 states.6