American Chemistry Society Spring 2021 Conference / Virtual
American Chemistry Society Spring 2021 Conference
The protonation of methyl phenyl porphyrin isomers was studied through UV vis spectroscopy using trifluoroacetic acid (TFA), a strong organic acid. Protonation was achieved by titration of the porphyrin in toluene and toluene/methanol (90:10). A wavelength shift from the free base Soret to the protonated Soret confirms the formation of the dication. The resulting UV spectra was used to calculate an apparent pKa value of each free base porphyrin isomer. Addition of methanol to the porphyrin solution decreased the average pKa values of the Soret and Q-bands for each porphyrin. This could be an indication of a stabilizing monocation, not easily seen in solution.
Swanson, Mamiko; De Angelis, Isabel; Chheda, Harsh; Patel, Rushi; Shah, Raahil; Patel, Shreya; and Ballester, Maria Ph.D., "Protonation of Methyl Phenyl Porphyrin Isomers Using UV Spectroscopy" (2021). Chemistry and Physics Faculty Proceedings, Presentations, Speeches, Lectures. 349.