Tricarbonyl(1,10-phenanthroline) (imidazole) rhenium(I): a powerful photooxidant for investigations of electron tunneling in proteins |
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Authors: | William B Connick Angel J Di Bilio Michael G Hill Jay R Winkler Harry BGray |
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Institution: | Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA |
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Abstract: | The structure of Re(CO)3(phen)(im)]2SO4·4H2O has been determined by X-ray crystallography. The yellow crystals are orthorhombic, space group Pccn (No. 56), with a=17.456(6), B=18.194(5), C=12.646(4) Å, R=0.063 for Fo2>0, R=0.032 for Fo2>3σ. The compound, which also has been characterized by IR, 1H NMR, and UV---Vis spectroscopies, exhibits room temperature luminescence in aqueous solution (τ=120 ns) as well as reversible oxidation and reduction in acetonitrile solution (1.85 and ?1.30 V versus SCE). The redox properties of the excited state of the complex (E0(Re+*/0 = 1.2; E0(Re2+/+*) = ?0.7 V) are being exploited in studies of laser-induced electron tunneling in Re(CO)3(phen)(histidine)-modified proteins. |
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Keywords: | Crystal structures Excited-state electron transfer Luminescence Rhenium-modified azurin Rhenium complexes Tricarbonyl complexes Diimine complexes |
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