Tetranuclear manganese-oxo complex with a 2. 7- angstrom Mn hor ellipsis Mn separation and intramolecular H sub 2 O hor ellipsis (. mu. -O) hydrogen-bonded contacts: (Mn sub 4 O sub 2 (TPHPN) sub 2 (H sub 2 O) sub 2 (CF sub 3 SO sub 3 ) sub 2 )(CF sub 3 SO sub 3 ) sub 3. Possible mode for binding of water at the active site of the oxygen-evolving complex in photosystem II

Journal Article · Wed Jun 06 00:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00168a067· OSTI ID:6651394

Chan, M K; Armstrong, W H ^[1]

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1. Univ. of California, Berkeley (USA)

Photosynthetic water oxidation is thought to occur at a polynuclear manganese aggregate within the photosystem II oxygen-evolving complex (PSII OEC). While X-ray absorption studies have established that Mn{hor ellipsis}Mn contacts of 2.7 and 3.3 {angstrom} are present in the OEC, the precise structure of the manganese aggregate has not been established. We are currently taking a synthetic analogue approach in order to elucidate this important biological process. Herein, we describe a novel tetranuclear complex. (Mn{sub 4}O{sub 2}(TPHPN){sub 2}(H{sub 2}O){sub 2}(CF{sub 3}SO{sub 3}){sub 2}){sup 3+} (1), which meets several important criteria for a synthetic analogue of the OEC manganese center in that it has a 2.7-{angstrom} Mn{hor ellipsis}Mn contact, coordinated H{sub 2}O molecules, and quasi-reversible electrochemical properties.

• OSTI ID: 6651394
• Journal Information: Journal of the American Chemical Society; (USA), Vol. 112:12; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
MANGANESE COMPLEXES
STRUCTURAL CHEMICAL ANALYSIS
PHOTOSYNTHESIS
BIOCHEMISTRY
DATA ANALYSIS
EXPERIMENTAL DATA
MEASURING METHODS
OXIDATION
WATER
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
HYDROGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
550200* - Biochemistry