THE STATE OF MANGANESE IN THE PHOTOSYNTHETIC APPARATUS [electronic resource] : FIRST VIEW OF THE MANGANESE SITES BY X-RAY ABSORPTION SPECTROSCOPY
- Published:
- Berkeley, Calif. : Lawrence Berkeley National Laboratory, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- 26 pages : digital, PDF file
- Additional Creators:
- Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- Manganese atoms have long been implicated as essential ingredients in photosynthetic oxygen evolution. Heretofore they have eluded direct observation. We report the first direct observation, by X-ray Absorption Spectroscopy, of the Mn sites in chloroplasts isolated from Spinacia oleracea. The manganese in chlorplasts is commonly thought to exist in two pools. The major pool, corresponding to two-thirds of the manganese, can be reversibly released with concomitant loss of oxygen evolving capacity, and has thus come to be assigned as the active pool. The role of the remanant one-third, or tightly bound pool is moot. Our analysis of the Extended X-ray Absorption Fine Structure of the active pool is consistent with a bridged dimeric structure involving two manganese atoms separated by about 2.7 {Angstroms}. The distance between manganese and bridging ligands is about 1.8 Å. Analysis of the edge region suggests that the manganese in the active pool exists in oxidation states somewhat higher than Mn(II).
- Report Numbers:
- E 1.99:lbl-11873
lbl-11873 - Subject(s):
- Other Subject(s):
- Note:
- Published through SciTech Connect.
11/01/1980.
"lbl-11873"
Proceedings of the National Academy of Science FT
Smith, J. P.; Kirby, Jon A.; Goodin, D. B.; Robertson, A. S.; Thompson, A. C.; Klein, M. P.
Chemical Sciences Division - Funding Information:
- DE-AC02-05CH11231
View MARC record | catkey: 13812529