Eleven-vertex polyhedral stannadicarbaborane chemistry. ‘naked tin’{closo-1,2,3-SnC2B8}-cluster compounds

Abstract

Reaction of anhydrous SnCl₂ with the nido ten-vertex anions [6,9-C₂B₈H₁₀]^2–, [6-Me-6,9-C₂B₈H₉]^2–, [6-Ph-6,9-C₂B₈H₉]^2– or [6,9-Me₂-6,9-C₂B₈H₈]^2– in tetrahydrofuran solution results in the formation of [closo-1,2,3-SnC₂B₈H₁₀](59%), [2-Me-closo-1,2,3-SnC₂B₈H₉](34%), [2-Ph-closo-1,2,3-SnC₂B₈H₉](21%) or [2,3-Me₂-closo-1,2,3-SnC₂B₈H₈](10%) respectively as volatile white solids. Their NMR properties suggest that the compounds are best regarded as true closo species analogous to closo-2,3-C₂B₉H₁₁.