Date of Completion
Honors College Thesis
William E. Geiger
porphyrins, oxygen reduction, surface-bound
The attachment nonmetal and magnesium ethynyl terminated porphyrin (TEPP and MgTEPP) to glassy carbon electrode was achieved through voltammetry. These attached porphyrins were studied by cyclic voltammetry (CV) and UV-visible spectroscopy. Surface-bound TEPP displayed reversible oxidation and reduction (E1/2 = 0.52 V and E1/2 = -1.74 V vs. ferrocene), and absorbance peak of 425 nm on indium tin oxide (ITO). While surface-bound MgTEPP possessed two reversible oxidations (E1/2 = 0.61 V and E1/2 = 0.97 V vs. Ag/AgCl) and an irreversible (Epc = -1.65 V vs. Ag/AgCl). MgTEPP had an absorbance maximum at 431 nm on ITO. Both porphyrins had irreversible pre-waves, which could be regenerated. This is the first example of covalently-bound Mg porphyrin to an electrode surface.
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Van Wyck, Stephen J., "A Route to Surface-bound Metalloporphyrins as Models for Oxygen Reduction Catalysts" (2017). UVM Honors College Senior Theses. 179.