Multi-Electron Transfer Systems : Characterization of 9,11,20,22-tetraazatetrapyridopentacene Reactions with Small Molecule Pollutants
Denkins, Zachery D.
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This study focused on characterizing the reaction of two excited forms of TATPP with several pollutants: trichloroethylene (TCE), polychloroethylene (PCE), and CO2. The first excited state of 9,11,20,22-tetraaza-tetrapyridopentacene (TATPP), TATPP(560), was formed in ethylene glycol (EthGly) and has a XmaK = 560 with 6560 = 6,000 M'W1. TATPP(560) was able to reduce TCE but not PCE. Also with TCE, TATPP could be recycled four times before peak absorbencies fell below instrument detection level. The second excited state of TATPP, TATPP(660) can be generated in the presence of base in DMSO. TATPP(660) has a Xmax = 660 nm and a 6660 = 10,000 M-1cm-1. TATPP(660) was able to reduce CO2, however, the terminal product was unable to be characterized through distillation, GC, and GC/MS analysis. Headspace analysis was carried out on a low molecular weight GC in attempt to detect a gaseous product but also proved unsuccessful. This study suggests thatCO2 is being photochemically reduced by TATPP(660)but the terminal product is still unknown.