The reactivity of hydrotris(3-methyl-2-thioxo-1-imidazolyl)borate (Tm) towards organotin(IV) acceptors. An unprecedented monodentate coordination mode of Tm ligand

Abstract

The reaction between RSnCl 3 (R=Me, Bu n or Ph), R 2SnCl 2 (R=Me, Et, Bu n or Ph) and R 3SnCl (R=Me, Bu n, Ph or cy) acceptors and equimolar amounts of hydrotris(3-methyl-2-thioxo-1-imidazolyl)borate potassium salt K[Tm] yields the complexes [(Tm)RSnCl 2], [(Tm)R 2SnCl] and [(Tm)R 3Sn], respectively. The NMR data ( 1H, 119Sn) showed the mono- and di-organotin derivatives to be five-coordinated in solution, whereas the triorganotin(IV) derivatives are tetrahedral both in solution and in the solid state, as confirmed by X-ray crystallography. The X-ray crystal structure of [(Tm)cy 3Sn] is the first example of a complex containing the Tm-ligand coordinated in monodentate fashion, with the tin in a quasi-regular tetrahedral environment and SnS bond being 2.478(1) Å.