DISULFUR-BRIDGED COMPLEXES OF MOLYBDENUM - CRYSTAL-STRUCTURE OF THE DIMOLYBDENUM(IV) COMPLEX [(MOCL3(C4H8S))2(MU-S2)(MU-C4H8S)] AND OF THE MO(IV)MO(V) COMPLEX [(ME2S)2CL2MO(MU-S2)(MU-S)MOCL3(SME2)]

Treatment of [Mo(CO)6] with S2Cl2 gave a very dark green material of e mpirical formula Mo2S2Cl6.CH2Cl2 1 which, on reaction with L, gave gre en [{MoCl3(L)}2(mu-S2)(mu-L)] (L = C4H8S 2a, PhCH2SMe 2b or C4H8O 2c), and with SMe2 gave the novel, brown, unsymmetrical, mixed-oxidation-s tate complex [(Me2S)2Cl2Mo(mu-S2)(mu-S)MoCl3(SMe2)] 3. The structures of 2a and 3 have been established by X-ray crystallography. Compounds 2a-2c are diamagnetic and NMR data have been obtained, whereas 3 is pa ramagnetic and shows, in a CH2Cl2 glass at 40 K, a broad, roughly axia l EPR resonance with g(max) at 1.94.