Tantalum Dimethyldithiocarbamate Complexes

The reaction of Ta(NMe2)(5) with CS2 gave the tantalum(V) dimethyldithiocarbamate complex [Ta((Me)Dtc)(4)]((Me)Dtc) (I). An ionic structure of the complex with a dodecahedral coordination of the tantalum atom was determined for toluene (I center dot Tol) and THF (I center dot THF) solvates by X-ray diffraction (CCDC no. 1544283 and no. 1544284, respectively). The reaction of I with CH2Cl2 leads to exchange of the outersphere anion to give the known complex [Ta((Me)Dtc)(4)]Cl (II). The cyclic voltammogram of II in CH3CN exhibits a quasi-reversible transition at E (1/2) =-0.735 V corresponding to the Ta-V/Ta-IV pair.