Addition of tetra-alkylthiuram disulphides [R2NC(S)S-SC(S)NR,] to MoVIS42-, WVlS42and MoV1O2S22yields the new complexes M o V ( S ~) ( S ~C N R ~) ~ and WvlS(S2)(S2CNR2)2 and the known complex MoV10(S2)(S2CNR2)2, respectively, revealing redox behaviour involving induced internal electron transfer and ligand electron transfer processes. Molybdenum1 and to a lesser extent tungsten2 are capable of existing in several oxidation states when bound by sulphur ligands. Likewise, sulphur ligands can exist in several oxidation states.3 The ability of sulphur ligands to undergo redox reaction while in the co-ordination sphere of Mo has been demonstrated in dinuclear and trinuclear systems.4.5 Recently, several examples have been reported in which the oxidation state of both the metal and the sulphur ligand 2M0"'S42-+ RS-SR + M o V ~S ~( S ~) ~~-

Die "Se‐NMR‐Spektren für 29 Se‐enthaltende Verbindungen ‐ die Titelverbindungen sowie Diethyl‐, Dibutyl‐ und Diisobutyldiselenocarbamato‐ Komplexe von Zn, Cd, Ni, Pd und Pt ‐ werden mitgeteilt.

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