COLL 449 |
| Zinc phthalocyanine (ZnPc) was entrapped in the bilayer membrane of cationic liposomes. Methyl viologen (MV2+) was immobilized on a genetically engineered, negatively charged, rod-like virus. Electrostatic interaction occurred between the MV2+-immobilized virus and ZnPc-entrapped liposome, resulting in the formation of a self-assembled virus-membrane complex with ZnPc embedded in the lipid bilayer. Steady state fluorescence and transient absorption spectroscopic studies indicate that electron transfer occurred between the membrane-trapped ZnPc and MV2+ immobilized on the virus, with the negatively charged virus serving as an electron relay. The presence of the virus also enhanced charge separation, leading to the formation of the oxidized ZnPc+•and the reduced methyl viologen radical (MV+•). In the absence of the virus, no electron transfer occurred due to the electrostatic repulsion between the cationic liposome and the MV2+. Our results suggest that the virus-membrane complex can serve as a novel media for solar energy conversion. |
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Interfacial Electron Transfer and Solar Energy Conversion: From Molecules to Nanomaterials
8:40 AM-12:00 PM, Thursday, April 10, 2008 Morial Convention Center -- Rm. 226, Oral
Division of Colloid & Surface Chemistry |