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Mixed valent sites in biological electron transfer Solomon EI; Xie X; Dey AChem Soc Rev 2008[Apr]; 37 (4): 623-38Many of the active sites involved in electron transfer (ET) in biology have more than one metal and are mixed valent in at least one redox state. These include Cu(A), and the polynuclear Fe-S clusters which vary in their extent of delocalization. In this tutorial review the relative contributions to delocalization are evaluated using S K-edge X-ray absorption, magnetic circular dichroism and other spectroscopic methods. The role of intra-site delocalization in ET is considered.|Binding Sites[MESH]|Circular Dichroism/methods[MESH]|Copper/*chemistry[MESH]|Electron Transport[MESH]|Iron-Sulfur Proteins/*chemistry[MESH]|Oxidation-Reduction[MESH]|Spectrometry, X-Ray Emission/methods[MESH]|Spectrophotometry/methods[MESH]|Thermodynamics[MESH]|X-Rays[MESH] |
