This paper studies the behaviour of some Mn (III)-(aromatic-aminosulfonic a
cids) complexes in the redox peocess. High stability of these complexes in
neutral or weakly basic medium has been observed. In strongly acidic medium
, in presence of the reducting agents take places the reduction of the Mn(I
II) and Mn(IV) species. In absence of reduting agent take place the disprop
ortion of the Mn(III) species.