ISONITROSOACETYLACETONE DITHIOSEMICARBAZONE COMPLEXES OF SOME 1ST ROWTRANSITION-METALS

Complexes of the potentially tetradentate ligand isonitrosoacetylaceto ne dithiosemicarbazone (inbtH-2) of formulae [Ti(inbtH2)Cl2]Cl2, [M(in bt)], where M = V(IV)O, Mn(II), Ni(II) or Zn(II), [M(inbtH-2)X2], wher e M = Co(II) and X = Cl, or M = Ni(II) and X = Cl, Br or I, and [M(inb tH2)Cl2]Cl, where M = Cr(III) or Fe(III), have been prepared and chara cterized by physico-chemical and spectroscopic methods. In all the com pounds the metal is coordinated by the thiocarbonyl sulphur and imine nitrogen, as revealed by i.r. studies. The n.m.r. spectra of the compl exes of Ni(II) and Zn(II) confirm coordination through nitrogen. Possi ble structures for the complexes are proposed. The Mossbauer spectrum of the Fe(III) complex is discussed.