Abstract Interactions of RuCl 3· 3H 2 O with radical cations of aromatic ethers, 1, 4-di-tert- butyl-2, 5-dimethoxybenzene, 3, 5-di-tert-butyl-1, 2-dimethoxybenzene and 2-tert-butyl-1, 4- di-methoxybenzene, and with aromatic amines, 2, 4, 6-tri-tert-butylaniline and N, N, N', N'- tetra-methyl-1, 4-phenylenediamine, were observed by voltammetry. ESR and UV spectroscopies were used for the study of the the first two ethers. The effect of RuCl 3· 3H ...