Preparation and properties of NN-dialkyldithiocarbamates of early transition elements

Abstract

Tetrakis-NN-dialkyldithiocarbamato-metals M(S₂CNR₂)₄(R = Me, Et, or Prⁿ and M = Ti^IV or Zr^IV; or R = Me, Et, or M = V^IV or Nb^IV) have been prepared by reactions involving the insertion of CS₂ into metal dialkylamides. The pentakis-compound Ta(S₂CNMe₂)₅ and the tin(IV) compound Sn(S₂CNEt₂)₄ were also obtained. Spectroscopic (u.v., visible, i.r., and n.m.r.) studies were carried out together with some magnetic susceptibility, electrical conductance, and X-ray diffraction measurements. The tetrakis-derivatives of Zr and Nb are probably examples of eight-co-ordination by sulphur but the structures of Ti^IV, V^IV, and Ta^V are open to doubt and require complete X-ray structural analysis.