The salts (Bz(3)NH)(3)[Mo6OCl13] (1) and (Bz(3)NH)(2)[Mo6Cll(4)]center dot 2CH3CN (II) were obtained by reacting melted tribenzylamine with cluster Mo compounds. Compound II contains a known cluster anionic complex [Mo6Cl14](2-). Compound I includes novel cluster anionic complex [Mo6OCl13](3-), where one internal Cl atom is replaced by the O atom. Complex II exhibits phosphorescence in a long-wavelength region of visible spectrum.