β-Diketonates of aryltellurium(lV) and diaryltellurium(IV)

Abstract

Some new diphenyltellurium(IV)-bis-β-diketonates, Ph₂ Te{RC(O):CHC(O)R'}₂(I) and 4-methoxyphenyltellurium-β -diketonates, 4-MeOC₆H₄ TeCl_3-n{RC(O):CHC(O)R'}n (II). n = 1-3, R = R' = Me, Ph or CF₃, have. been synthesized by the reaction of RC(O)Na:CHC(O)R' with Ph₂TeCl₂ and MeOC₆H₄ TeCI₃. The compounds have been characterized on the basis of elemental analyses, molecular weights, molar conductance measurements and spectral data (IR, ¹H and ¹³C NMR). Molecular weight measurements suggest that the compounds of the type (I) are monomeric and those of the type (II) are dimeric in solution. The asymmetric chelation of β -diketonate moiety with tellurium in (I) and bridging of the two tellurium atoms by oxygen atoms of β-diketonate moieties in (II) are inferred from the IR and ¹H NMR data.