title: Solvent Effects on the UV-Vis Absorption Properties and Tautomerism of N-Confused Tetraphenylporphyrin.
abstract: The two tautomeric forms of N-confused tetraphenylporphyrin (NCTPP) show distinctly different absorption spectra. The existence of each tautomer in solution has been shown to be strongly solvent-dependent. In the present work, we have studied the tautomerization using absorption spectroscopy in 15 different solvents. While changes in the two tautomers are not large in the Soret band region, the distinct spectral changes between the two tautomers in the Q-band region provide a convenient way to measure the concentration of each tautomer. The resulting data shows a strong correlation between the tautomer and the H-bond accepting ability of the solvent. The anomaly in this data is for the alcoholic solvents ethanol and methanol, for which we observe evidence for H-bonding, presumably between the exterior N2 nitrogen of the NCTPP and the O-H proton of the solvent.
authors.affiliation: Department of Chemistry, California State University Stanislaus , One University Circle, Turlock, California 95382, United States.
authors.forename: Elvin A
authors.initials: EA
authors.lastname: Alemán
authors.affiliation: Department of Chemistry and The Center for Laser and Optical Spectroscopy, Knight Chemical Laboratory, The University of Akron , Akron, Ohio 44325-3601, United States.
authors.forename: Jojo
authors.initials: J
authors.lastname: Joseph
authors.affiliation: Department of Chemistry and The Center for Laser and Optical Spectroscopy, Knight Chemical Laboratory, The University of Akron , Akron, Ohio 44325-3601, United States.
authors.forename: David A
authors.initials: DA
authors.lastname: Modarelli