Abstract
Protonation of phenyl porphyrins induced by THF has been investigated. After ionization, the positive charge was localized in the π-electron system. UV spectras have been studied for the ortho, meso, and para cation positions. Upond acid treatment of N-methyl-2-pyridyl, and N-methyl-3-pyridyl, the soret peak and Q bands showed a shlight red shift, signifying a lowering of energy levels of the excited and unexcited states of the π-electrons. However, the soret peak and Q bands of N-methyl-3-pyridyl showed a slight blue shift. This accounted for the increased solvation of π-electrons at the meso position, which increased the energy level difference between the excited and unexcited states. These findings proved that charge distribution of a molecule is influenced by cation positions.
Faculty Sponsors
Dr. Maria Ballester
Project Type
Event
Location
Alvin Sherman Library
Start Date
4-13-2012 1:00 PM
End Date
4-13-2012 5:30 PM
Characterization of the UV Absroption Spectra of N-Methylpyrydil Porphyrins
Alvin Sherman Library
Protonation of phenyl porphyrins induced by THF has been investigated. After ionization, the positive charge was localized in the π-electron system. UV spectras have been studied for the ortho, meso, and para cation positions. Upond acid treatment of N-methyl-2-pyridyl, and N-methyl-3-pyridyl, the soret peak and Q bands showed a shlight red shift, signifying a lowering of energy levels of the excited and unexcited states of the π-electrons. However, the soret peak and Q bands of N-methyl-3-pyridyl showed a slight blue shift. This accounted for the increased solvation of π-electrons at the meso position, which increased the energy level difference between the excited and unexcited states. These findings proved that charge distribution of a molecule is influenced by cation positions.
