Abstract
A dimer-of-dimers model compound for the oxygen-evolving complex of photosystem II, [{(H2O)-(terpy)MnIV(μ-O) 2MnIV(terpy)}2(μ-O)](CIO4) 6 (terpy = 2,2′:6′,2″-terpyridine), has been prepared and characterized by X-ray crystallography and ESI-MS. Low pH was found to promote the disproportionation of [MnIII/IV 2O2(terpy)2(OH2)2] 3+ to Mn2+ and a MnIV/IV2O 2(terpy)2 species; the latter complex slowly dimerizes to form the title complex. Protonation of a μ-oxo bridge is proposed to initiate the disproportionation, based on analogy with the [Mn III/IV2O2(bpy)4]3+ system.
Original language | English |
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Pages (from-to) | 7345-7349 |
Number of pages | 5 |
Journal | Journal of the American Chemical Society |
Volume | 126 |
Issue number | 23 |
DOIs | |
Publication status | Published - Jun 16 2004 |
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry