THE IMPORTANCE OF VARYING THE LEWIS ACIDITY OF R2SN IN DETERMINING THE MOLECULAR-STRUCTURE OF R2SN(1,1-DITHIOLATE) COMPOUNDS - THE CRYSTAL AND MOLECULAR-STRUCTURES OF 3 DIVINYLTIN N,N-DIALKYLDITHIOCARBAMATES

The crystal structures of vin(2)Sn(S2CNR'(2))(2) where R'=Et, cHex and R-2=(Et, cHex), have been determined. The tin atom in each structure exists in a skew-trapezoidal bipyramidal geometry as a result of asymm etrically chelating dithiocarbamate ligands and the disposition of the vinyl substituents over the weaker Sn-S interactions. Structural corr elations are made with related systems and highlight the importance of electronic factors (i.e. the Lewis acidity of the R2Sn entity) in det ermining which structural motif is adopted in the solid state.