{sup 35}Mn ESE-ENDOR of a mixed valence Mn(III)Mn(IV) complex: Comparison with the Mn cluster of the photosynthetic oxygen-evolving complex

Journal Article · Wed Nov 29 04:00:00 EST 1995 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00152a021· OSTI ID:174266

Randall, D W; Sturgeon, B E; Ball, J A; Lorigan, G A; Chan, M K; Britt, R D ^[1]; Klein, M P ^[2]; Armstrong, W H ^[3]

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1. Univ. of California, Davis, CA (United States)
2. Lawrence Berkeley Lab., CA (United States)
3. Boston College, Chestnut Hill, MA (United States)

Analysis of {sup 55}Mn electron spin echo-electron nuclear double resonance (ESE-ENDOR) spectra obtained on a dinuclear mixed valence Mn(III)Mn(IV) complex [di-{mu}-oxotetrakis(2, 2`-bipyridine)dimanganese(III,IV)] (1) reveals the hyperfine and nuclear quadrupolar parameters for the spin I=5/2 {sup 55}Mn nucleus of both Mn(III) and Mn(IV) ions. The {sup 55}Mn ESE-ENDOR data obtained on the g = 2 Mn multiline EPR signal of the S{sub 2} state of the photosystem II oxygen-evolving complex demonstrate that this EPR signal cannot arise from a dinuclear Mn(III)-Mn(IV) center. The ENDOR spectra are consistent with a tetranuclear Mn cluster origin for the photosystem II multiline EPR signal. 75 refs., 7 figs., 2 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 174266
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 47 Vol. 117; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ACOUSTIC ESR
COMPUTERIZED SIMULATION
ELECTRON SPECTRA
ENERGY LEVELS
MANGANESE COMPLEXES
ORGANOMETALLIC COMPOUNDS
SOLID CLUSTERS