Several [M(C3S5)(3)](n-) (M = V(IV), Mo(IV), W(IV); n = 2 and M = Nb(V), Re(V); n = 1) anion complexes were prepared. They exhibited low oxidation potentials of +0.145 - +0.76 V vs. SCE. They were oxidized by reactions with iodine, [Fe(C5Me5)2](+), [Fe(C5H5)2]+, and the TTF.+ radical cation, as well as the electrolysis, in organic solvents to afford oxidized [M(C3S5)3](m-) (0 < m < 1) species having electrical conductivities of 6.0 x 10(-5) - 1.5 x 10(-1) S cm(-1) measured for compacted pellets at room temperature. X-ray crystal structures of the [M(C3S5)(3)](2-) (M = Mo, W) complexes and the one-electron-oxidized [M(C3S5)3](-) (M = V, W) species as well as ESR and X-ray photoelectron spectra of the oxidized species are discussed.