A sulfur rich electron acceptor and its [Fe(Cp*)(2)](+) charge transfer salt with ferromagnetic interactions

The study of a side product of the aerial dithiolene oxidation allowed the rational and efficient synthesis of a sulfur rich electron acceptor, (E)-3,3'-diethyl-5,5'-bithiazolidinylidene-2,4,2', 4'-tetrathione, that presents easily accessible redox states and forms with decamethylferrocene a charge transfer salt exhibiting ferromagnetic coupling.