The magnetic behavior of n-alkyliron(lll) (or n-aryliron(III)) porphyrins is studied in solution and in solid state by various spectroscopic methods: *H NMR, ESR, and 57Fe Móssbauer spectroscopies. Variable-temperature magnetic susceptibility measurements were also performed on these complexes. The iron(III) atom of these compounds is present in different spin states.

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Sulphinatoiron(iii) porphyrins [FeL(S02R)] (L = porphyrinate, R = alkyl or aryl) have been prepared by the insertion reaction of sulphur dioxide into the Fe-C cr bond of alkyl(or aryl)iron(tii) porphyrins [FeLR]. The obtained products are easily oxidised by molecular oxygen to the corresponding sulphonate derivatives, also generated by acid hydrolysis of the Fe-0 bonds of the p-0x0-dimers [(FeL),O] by the appropriate sulphonic acid. The stereochemistry of the metal centre has been established by l H n.m.r., e.s.r., and i.r. measurements and confirmed by the crystal structure determination of the title compound by X-ray diffraction methods. The crystals are triclinic, space group P1 , with a = 11.01 (2), b = 11.09(1 ), A-B ( 2 : 1)

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