Collect. Czech. Chem. Commun. 1984, 49, 2579-2585

Reduction and spin transition of some macrocyclic Fe(III) complexes

Dana M. Wagnerováa, Pavel Stopkaa, Günter Lassmannb and Bernd Ebertb

a Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6
b Central Institute of Molecular Biology, Academy of Sciences of the GDR, 1115 Berlin-Buch


The ESR and absorption spectroscopies were used to study the reduction of Fe(III) tetrasulphophthalocyanine (FeTSP) and Fe(III) chloro-deuteroporphyrin (FeCDP) by ascorbic acisd and cysteine. Only the monomeric form of Fe(III)TSP gives an ESR spectrum, while the dimer is ESR quiet. The complex is low-spin, and is rapidly reduced by both substrates to Fe(II)TSP. The spin states of the complexes are correlated with their catalytic activity in the oxidation of the substrates by dioxygen.