Abstract
The formation of molecular oxygen from water in photosynthesis is catalyzed by photosystem II at an active site containing four manganese ions that are arranged in di-mu-oxo dimanganese units (where mu is a bridging mode). The complex [H2O(terpy)Mn(O)2Mn(terpy)OH2](NO3)3 (terpy is 2,2':6', 2"-terpyridine), which was synthesized and structurally characterized, contains a di-mu-oxo manganese dimer and catalyzes the conversion of sodium hypochlorite to molecular oxygen. Oxygen-18 isotope labeling showed that water is the source of the oxygen atoms in the molecular oxygen evolved, and so this system is a functional model for photosynthetic water oxidation.
Publication types
-
Research Support, U.S. Gov't, P.H.S.
MeSH terms
-
Catalysis
-
Dimerization
-
Electron Spin Resonance Spectroscopy
-
Ligands
-
Manganese / chemistry
-
Manganese / metabolism
-
Manganese Compounds / chemistry
-
Models, Chemical
-
Oxidation-Reduction
-
Oxides / chemistry
-
Oxygen / chemistry
-
Oxygen / metabolism*
-
Oxygen Isotopes
-
Photosynthesis*
-
Photosynthetic Reaction Center Complex Proteins / metabolism*
-
Photosystem II Protein Complex
-
Sodium Hypochlorite / chemistry
-
Water / chemistry
-
Water / metabolism
Substances
-
Ligands
-
Manganese Compounds
-
Oxides
-
Oxygen Isotopes
-
Photosynthetic Reaction Center Complex Proteins
-
Photosystem II Protein Complex
-
Water
-
permanganic acid
-
Manganese
-
Sodium Hypochlorite
-
Oxygen