The first structurally authenticated divalent lanthanide stannyl derivative

Abstract

The reaction between Ybl₂ and K[Sn(CH₂Bu^t)₃] affords the diamagnetic ytterbium bis-stannyl derivative [Yb(SnNep₃)₂(thf)₂]1(Nep = 2,2-dimethylpropyl and thf = tetrahydrofuran) which has been characterised by multinuclear NMR spectroscopy (¹¹⁹Sn and ¹⁷¹Yb) and X-ray crystallography: reaction of 1 with two equivalents of ArOH (ArOH = 2,6-di-tert-butyl-4-methylphenol) or C₅Me₅H results in the elimination of Sn(CH₂Bu^t)₃H to afford the known complexes [Yb(OAr)₂(thf)₂] and [Yb(C₅Me₅)₂(thf)₂] respectively whereas the reaction with one equivalent of ArOH or C₅Me₅ results in the formation of the novel mixed ligand complexes [Yb(OAr){Sn(CH₂Bu^t)₃}(thf)₂] and [Yb(C₅Me₅){{Sn(CH₂Bu^t)₃}(thf)₂].