Abstract The complexes formed between iron (II) and some aromatic anions (benzoate and 4-aminoderivate, salicylate and 4-aminoderivate, thiosalicylate) have been investigated in dimethylsulphoxide (DMSO). The complexation ratios and the stability constants of the species have been determined at 25 C and compared, when possible, with the data obtained in ethanol. The results allow us to discuss the effect of the solvent properties and ...