Effects of Core and/or Peripheral Protonation of meso-Tetra(2-, 3-, and 4-pyridyl)Porphyrin and meso-Tetra(3-methylpyridyl)Porphyrin on Their UV-vis Spectra

Table 4

UV-vis spectral data for the dications of H₂t(py)P with HClO₄ in CH₂Cl₂^a.

Porphyrins and the dications	Soret band	Q(0,0) band
	(λ/nm)	(λ/nm)
H2t(2-py)P	417.0	642.0
[H4t(2-py)P](ClO4)2	471.3	663.3
Δν (cm^−1)	−2762.9	−500.2
H2t(3-py)P	418.0	646.4
[H4t(3-py)P](ClO4)2	458.9	653.1
Δν (cm^−1)	−2132.2	−158.7
H2t(4-py)P	416.0	643.0
[H4t(4-py)P](ClO4)2	469.0	661.0
Δν (cm^−1)	−2720	−425.3

aSee the footnotes of Table 2.