Structure and bonding in some alkyl- and aryltin(IV) derivatives with sulfur-containing ligands studied by i.r. and 1H NMR spectroscopy

A series of diorganotin(IV) and triorganotin(IV) derivatives of monothiocarboxylate and xanthate ligands, as well as several mixed-ligand diorganotin(IV) derivatives resulting from combinations of monothiocarboxylate, xanthate or N,N-dimethyldithiocarbamate ligands were prepared and studied. The structures of these complexes were discussed in the light of i.r. and ¹H NMR spectra. From an exhaustive study of the i.r. spectra of the new compounds, in relation to the i.r. spectra of some other monothiocarboxylate and xanthate derivatives of transition and non-transition metals, whose structures are known, some criteria for distinguishing the bonding mode of these ligands to the central atom have emerged. On the basis of these criteria, possible structures for the new compounds are proposed and are shown to be dependent on the number and the nature of the organo-groups attached to the tin atom.