Arylbis(thiosemicarbazone)tellurium(II) chlorides; three coordinate tellurium(II) complexes

Abstract

Three coordinate tellurium(II) complexes of the type [ArTe(XTSC) 2]Cl, where Ar = C 6H 5, 4-HOC 6H 4 or 4-CH 3OC 6H 4 and XTSC = thiosemicarbazone of benzaldehyde, acetophenone, salicylaldehyde or 2-hydroxyacetophenone, have been synthesized by treating ArTeCl 3 with the thiosemicarbazones in aqueous methanol. Molecular weight and conductivity measurements suggest that the chlorine in these complexes is ionic. The IR, 1H and 13C NMR data suggest that coordination of the XTSC is through sulphur alone, probably giving three coordinate tellurium in [ArTe(XTSC) 2] +. The nature ot TeS bonding and the stability of the complexes is discussed.