SOLID-STATE NMR-STUDY OF SOME SUBSTITUTED SILATRANE COMPOUNDS

Solid state NMR technique has been applied in the study of three synth esized silatranyl carboxylic acid compounds. The C-13, Si-29 and N-15 NMR chemical shifts of the compounds are obtained. The experimental re sults show that in the solid state the silatrane structures are distor ted when there is a non-axial carboxyl substituent. In such cases, the strength of the N-Si dative bond is not normally reflected by the beh avior of Si-29 and N-15 chemical shifts, and no hydrogen bond or salt is formed in the molecule. The experimental results and discussion are presented in detail.