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The structure and the nature of the bonds in trimethyltin fluoride are discussed on the basis of the infrared and the Raman spectra with reference to the results of the X-ray diffraction study by Clark et al. and a few additional X-ray data obtained on the fluoride and related trimethyltin compounds. The most reasonable structure is one in which the planar trimethyltin group is bridged by the fluorine atom forming a non-linear unsymmetrical Sn-F…Sn bond. The distorted bipyramidal configuration around the tin atom can be explained in terms of involvement of the d-orbitals of the tin atom in the bonding.

Several dimethylthallium derivatives were studied by means of a study of their IR and NMR spectra and by measurements of their physical properties. These new compounds, (CH3)2· TlSC6H5, (CH3)2TlOC6H4Cl-o, and (CH3)2Tl[B(C6H5)], are described. By correlation with earlier reports, it is possible to classify dimethylthallium derivatives into two groups according to the nature of the hybridization of the Tl-bonding orbitals. The experimental results can be interpreted in a straightforward and consistent manner.

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