Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
A fast atom bombardment mass spectrometric study of the meso-substituent effect of Octaethylporphyrins (OEPX, X = NH2, CH3, H, CHO, Cl, CN, NO2) is reported. The intensity of the [M + H]+ ion peaks was estimated quantitatively using an external standard, which was observed to be correlated linearly with the basicity (pK3) of the OEPX. The pK3 value of the OEPXs was obtained by titration with perchloric acid and it was observed to be correlated linearly with Hammett's σp value, with a ρ value of 1.38.
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