DIORGANOTELLURIUM(IV) BIS(FLUOROCARBOXYLATES)

Diorganotellurium(IV) bis(fluorocarboxylates)[R2Te(OCOR')2] [R = Me, P h,p-MeOC6H4 and p-EtOC6H4; R' = CF3, C2F5, C3F7] have been prepared by the interaction of R2Te(OMe)2 with fluorocarboxylic acids (R'COOH). I dentical products were obtained by the metathetical reaction of R2TeCl 2 with silver salts of the fluorocarboxylic acids in 1:2 molar ratios. However, when the reaction proceeded in a 1:1 molar ratio, the produc t was R2TeCl(OCOR'). However, reaction of R2TeO with CF3COOH yielded { [(R2TeOCOCF3)20]2.H2O} and [(R2TeOCOCF3)2O] Species. The products are non-conducting and monomeric in solution. The mode of bonding of the f luorocarboxylate group and a possible geometry around the central tell urium atom are suggested on the basis of physicochemical and spectral (IR, mass, H-1, C-13, F-19 and Te-125 NMR) studies.