Spectroscopic Studies of the Simpler Porphyrins II. The Absorption Spectra of Porphine and Isoporphine, ms-Tetravanillinporphine and ms-Tetravanillinisoporphine, ms-Tetrapropylporphine and ms-Tetrapropylisoporphine, ms-Tetra-n-butylporphine and ms-Tetraisobutylporphine

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Abstract
The molecular absorption coefficients of porphine and two aliphatic ms‐tetrasubstituted porphines and one aromatic ms‐tetrasubstituted porphine, together with their corresponding isomers have been measured for a portion of the visible region of the spectrum. The curves representing the absorptions coefficient as a function of wave‐length are shown. In porphine and the aromatic ms‐tetrasubstituted porphine a displacement in the spectrum toward the red region and a decrease in the magnitude of the absorption coefficients was observed, when the two isomers were compared. The aliphatic ms‐tetrasubstituted porphine showed very little shift in the spectrum but a large increase in the value of the absorption coefficients for the case where the isomerism was in the fundamental ring of porphine. The shift was small and the value of the absorption coefficients nearly equal when the isomerism was in the side chain in the meso‐position.

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