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Distance Dependence Of Electron Transfer Along Artificial Beta-Strands At 298 And 77 K, S. R. L. Fernando, Gennady V. Kozlov, Michael Y. Ogawa
Distance Dependence Of Electron Transfer Along Artificial Beta-Strands At 298 And 77 K, S. R. L. Fernando, Gennady V. Kozlov, Michael Y. Ogawa
Chemistry Faculty Publications
Photoinduced electron-transfer rate constants were measured for a series of binuclear metallopeptides consisting of a [Ru(bpy)(2)(cmbpy)](2+) electron donor tethered to a Co-III(NH3)(5) electron acceptor by an oligovaline peptide chain (bpy = 2,2'-bipyridine, cmbpy = 4-carboxy-4'-methyl-2,2'-bipyridine). These compounds were shown by H-1 NMR to adopt the conformational properties found within the individual strands of a beta-pleated sheet in both aqueous and methanol solutions. Emission lifetime measurements and HPLC product analysis show that the binuclear donor/acceptor compounds undergo photoinduced electron transfer (ET). The values of k(et) decrease with increasing donor/acceptor distance according to the expression k(et) = k' exp[-beta(r(-)r(0))]. A distance attenuation …