CHED 262 |
| Porphyrins and metallo-porphyrin nanoparticles are important supramolecular materials because of their photochemistry, stability, and catalytic activities. These nanoparticles were made by host/guest solvent methods. For example, 5,10,15,20-tetrakis(pentafluoropheny)porphineinato iron(III) can be fashioned into self-organized 10-20nm diameter nanoparticles using mixing solvent techniques. The nanoparticles were characterized by dynamic light scattering and atomic force microscopy. UV-visible and fluorescence spectra were taken to examine and compare the electronic absorption and emission between the molecules and the particles. These nanoparticles are found to catalyze the oxidation of cyclohexene to yield the alcohol and the ketone rather than the epoxide that results from the saturated metallo-porphyrin. Furthermore, di-oxygen can be used as an oxidant instead of hydrogen peroxide. The use of di-oxygen, as opposed to hydrogen peroxide, makes this greener chemistry. The turnover numbers are greater than ten fold that of the system in solution. The activity and the mechanism will be discussed. |
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Undergraduate Research Poster Session
2:30 PM-4:30 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Chemical Education |