Intramolecular Electron Transfer from Mn or Ligand Phenolate to Photochemically Generated RuIII in Multinuclear Ru/Mn Complexes. Laser Flash Photolysis and EPR Studies on Photosystem II Models
作者： Dirk Burdinski , Karl Wieghardt , Steen Steenken
DOI: 10.1021/JA991402D
关键词:
摘要: In a mononuclear MnIV and trinuclear MnII complex, the ligands of which contain electron-rich phenols (coordinated to Mn('s)) covalently attached ruthenium(II) 2,2‘-trisbipyridyl(=bpy)-type groups, intramolecular electron transfer (ET) from phenolate ligand (in complex) or photochemically (λexc= 455 nm) generated RuIII takes place with k ≥ 5 × 107 s-1, giving rise corresponding phenoxyl radical (complexed MnIV) MnIII, respectively. Thus, in source that reduces photogenerated RuIII(bpy•-) moiety is MnII, contrast situation where stems phenolate. The half-life coordinated phenoxyl-type Ru(bpy)/Mn complex (as produced presence [CoIII(NH3)5Cl]2+) order 0.5−1 ms. Ru(bpy) compound containing three (phenolate-ligated) atoms first example photoche...
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sci-hub.se 参考文章(60)
Joachim M. Hockertz, Steen Steenken, Claudia Stockheim, Karl Wieghardt, Radicals in Aqueous Solution from Fe(III) Complexes with Macrocyclic Ligands Containing Phenolates Springer Netherlands. pp. 133- 144 ,(1997) , 10.1007/978-94-017-1607-9_10
James E. Penner-Hahn, Structural characterization of the Mn site in the photosynthetic oxygen-evolving complex Structure & Bonding. pp. 1- 36 ,(1998) , 10.1007/3-540-62888-6_1
H. Rau, R. Frank, G. Greiner, Rate dependence of electron transfer on donor-acceptor separation and on free enthalpy change. The tris(2,2'-bipyridine)ruthenium(2+)/viologen2+ system The Journal of Physical Chemistry. ,vol. 90, pp. 2476- 2481 ,(1986) , 10.1021/J100402A042
D Thompson, K Norbeck, L I Olsson, D Constantin-Teodosiu, J Van der Zee, P Moldéus, Peroxidase-catalyzed oxidation of eugenol: formation of a cytotoxic metabolite(s). Journal of Biological Chemistry. ,vol. 264, pp. 1016- 1021 ,(1989) , 10.1016/S0021-9258(19)85046-9
Stephen F. McClanahan, Richard F. Dallinger, F. James Holler, James R. Kincaid, Mixed-ligand poly(pyridine) complexes of ruthenium(II). Resonance Raman spectroscopic evidence for selective population of ligand-localized 3MLCT excited states Journal of the American Chemical Society. ,vol. 107, pp. 4853- 4860 ,(1985) , 10.1021/JA00303A008
Craig P. Anderson, Dennis J. Salmon, Thomas J. Meyer, Roger C. Young, Photochemical Generation of Ru(bpy)3+ and 02 - Journal of the American Chemical Society. ,vol. 99, pp. 1980- 1982 ,(1977) , 10.1021/JA00448A054
M. Reza Razeghifard, Christof Klughammer, Ronald J. Pace, Electron paramagnetic resonance kinetic studies of the S states in spinach thylakoids. Biochemistry. ,vol. 36, pp. 86- 92 ,(1997) , 10.1021/BI9614287
Margareta R. A. Blomberg, Per E. M. Siegbahn, Stenbjörn Styring, Gerald T. Babcock, Björn Åkermark, Peter Korall, A Quantum Chemical Study of Hydrogen Abstraction from Manganese-Coordinated Water by a Tyrosyl Radical: A Model for Water Oxidation in Photosystem II Journal of the American Chemical Society. ,vol. 119, pp. 8285- 8292 ,(1997) , 10.1021/JA9642323
H.B. Ambroz, G.K. Przybytniak, Cz. Stradowski, M. Wolszczak, Optical spectroscopy of the aryl cation, the intermediate in the decomposition of arenediazonium salts Journal of Photochemistry and Photobiology A: Chemistry. ,vol. 52, pp. 369- 374 ,(1990) , 10.1016/1010-6030(90)85016-P
William T. Dixon, David Murphy, Determination of the acidity constants of some phenol radical cations by means of electron spin resonance Journal of the Chemical Society, Faraday Transactions. ,vol. 72, pp. 1221- 1230 ,(1976) , 10.1039/F29767201221