Cationic Five-Coordinate Bis(guanidinato)silicon(IV) Complexes with SiN4 El Skeletons (El=S, Se): "Heterolytic Activation" of S-S and Se-Se Bonds.

The donor-stabilized silylene [iPrNC(NiPr2)NiPr](2)Si (2) reacts with PhEl-ElPh (El = S, Se) to form the respective cationic five-coordinate bis(guanidinato)silicon(IV) complexes {[iPrNC(NiPr2)NiPr](2)SiSPh}+PhS- (4) and {[iPrNC (NiPr2)NiPr](2)SiSePh}(+) PhSe- (5). Compounds 4 and 5 were characterized by crystal structure analyses and NMR spectroscopic studies in the solid state.