Determination of the 13C NMR chemical shifts in an a2u type iron(III) porphyrin cation radical

The 13C NMR chemical shifts of all the carbons in an a2u type iron(III) porphyrin radical cation, [Fe(TPP)Cl]+, have been determined for the first time by the titration method as well as by the chemical shift correlation; they are 2230, 1050, and –1910 ppm for the (alpha)-pyrrole, (beta)-pyrrole, and meso carbon atoms, respectively.