Reactions of triethylmetal(IV) chlorides with sodium salts of internally functionalised oximes in a 1:1 molar ratio in refluxing anhydrous benzene yield [Et₃M{ON=C(R)Ar}] [where R = H, Me; M = Ge (1-5), Sn (6,7) or Pb (8-12); Ar = 2-C₅H₄N, 2-C₄H₃O or 2-C₄H₃S]. All these derivatives have been characterised by elemental analysis and IR and NMR [¹H, ¹³C{1H}, ¹¹9Sn{1H} and ²⁰⁷Pb{¹H}] spectroscopic studies. Absence of any significant shift in the hetero-aryl ring carbon / proton resonances and the presence of chemical shifts at ≊δ110 ppm in ¹¹⁹Sn NMR and at ≊ δ 400 ppm in ²⁰⁷Pb NMR spectra of these derivatives have been interpreted in terms of a tetrahedral geometry around the metal atom.