Several dithiadiazafulvalenes, which are potent electron donors, were isolated as pure compounds for the first time. Solid charge-transfer complexes with TCNQ and also cation-radical and dication salts with perchlorate gegenions were obtained. Two of the TCNQ complexes are moderately conductive at room temperature (0.083 and 0.011 S/cm). A solution EPR study, combined with theoretical calculations, allowed the determination of the relative equilibrium cation-radical and anion-radical concentrations.