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Medientyp:
E-Artikel
Titel:
A Functional Model for O-O Bond Formation by the O 2 -Evolving Complex in Photosystem II
Beteiligte:
Limburg, Julian;
Vrettos, John S.;
Liable-Sands, Louise M.;
Rheingold, Arnold L.;
Crabtree, Robert H.;
Brudvig, Gary W.
Erschienen:
American Association for the Advancement of Science (AAAS), 1999
Erschienen in:Science
Sprache:
Englisch
DOI:
10.1126/science.283.5407.1524
ISSN:
0036-8075;
1095-9203
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>
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-μ-oxo dimanganese units (where μ is a bridging mode). The complex [H
<jats:sub>2</jats:sub>
O(terpy)Mn(O)
<jats:sub>2</jats:sub>
Mn(terpy)OH
<jats:sub>2</jats:sub>
](NO
<jats:sub>3</jats:sub>
)
<jats:sub>3</jats:sub>
(terpy is 2,2′:6′,2"-terpyridine), which was synthesized and structurally characterized, contains a di-μ-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.
</jats:p>