The structures of 2,2-dialkyl-1,3,2-dithiastannolanes

Article abstract of DOI:10.1016/0022-328X(88)83117-6

The structure of 2,2-dibutyl-1,3,2-dithiastannolane in the solid state has been determined by single crystal X-ray diffraction.Individual molecules interact weakly with two neighbouring molecules to form two long (3.688 Angstroem) Sn-S coordinate bonds.The tin atoms can therefore be regarded as being weakly 6-coordinate.In contrast, in the crystal, 2,2-dimethyl-1,3,2-dithiastannolane forms one short coordinate bond (3.18 Angstroem) to a neighbouring molecule, and the tin can be regarded as being strongly 5-coordinate.The (13)C and (117/119)Sn NMR spectra of the dimethyl-, diethyl-, diisopropyl-, and dibutyl-stannolanes, and of spirobis(ethane-l,2-dithiolato)tin have been recorded in solution and the solid state, and correlated with the evidence from X-ray crystallography.It is argued that the diethyl- and diisopropyl-stannolanes have structures similar to that of the dibutyl derivative.