Tin(IV) Fluoride Complexes with Tertiary Phosphane Ligands – A Comparison of Hard and Soft Donor Ligands

Abstract

AbstractThe first phosphane complexes of the hard Lewis acid SnF4 have been synthesised including trans‐[SnF4(PR3)2] (R = Me or Cy) and cis‐[SnF4(diphosphane)] [diphosphane = R2P(CH2)2PR2, R = Me, Et, Ph or Cy; o‐C6H4(PR2)2, R = Me or Ph] and characterised by IR and multinuclear NMR (1H, 19F, 31P, 119Sn) spectroscopy. The crystal structures of trans‐[SnF4(PCy3)2] and cis‐[SnF4{Et2P(CH2)2PEt2}] are reported. Tin(IV) fluoride complexes of 2,2′‐bipyridyl, 1,10‐phenanthroline, MeO(CH2)2OMe, Me2N(CH2)2NMe2, pyridine and THF have been characterised by multinuclear NMR spectroscopy, the structures of cis‐[SnF4(L–L)] (L–L = 1,10‐phenanthroline and MeO(CH2)2OMe) determined, and the properties were compared with those of the phosphane complexes. Complexes of o‐C6H4(PMe2)2, Et2P(CH2)2PEt2, and MeC(CH2AsMe2)3 with SnCl4 and SnBr4 are also reported and the structures of cis‐[SnCl4{Et2P(CH2)2PEt2}] and cis‐[SnBr4{κ2‐MeC(CH2AsMe2)3}] described. Attempts to prepare tertiary arsane complexes of SnF4 have been unsuccessful. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)