BIS(SULFURDIIMIDO)TIN AND TRIS(SULFURDIIMIDO)SILICON, -GERMANIUM AND -TIN COMPOUNDS—STRUCTURE IN SOLUTION AND IN THE SOLID STATE AS DETERMINED BY MULTINUCLEAR MAGNETIC RESONANCE

Abstract

Abstract Bis(sulfurdiimido)tin (1a-5a, 3b, 4b) and tris(sulfurdiimido)element compounds (element = Si, Ge, Sn; 6a, 7a,b-9a,b) were prepared and studied by multinuclear magnetic resonance in solution (1H, 13C, 15N, 29Si, 119Sn NMR) and in the solid state (13C, 15N, 119Sn CP/MAS NMR). All compounds are fluxional molecules in solution with respect to fast E/Z = Z/E isomerization. In the case of N-tert-butyl derivatives; the configuration of the respective isomers could be assigned by low temperature NMR measurements. For example, in the case of 1Bu2Sn(NSN′Bu)2, 4a, two configurational isomers are present in solution, but only one in the solid state. In the case of the tin compounds, all NMR data point towards association both in solution (at low temperature) and in the solid state, the tendency for association being greatest for n-butyl-tris(N-tert-butylsulfurdiimido)tin (6a).