Synthesis and structural characterisation of bis(trimethylsilyl)amidotin(II) triflate [{Sn(NR2)(μ-η2-OTf)2}]∞ (R=SiMe3, −OTf=−OSO2CF3)

The amidotin(II) triflate [{Sn(NR2){μ-η2-∞ (1) has been prepared in high yield by two methods: from Sn(NR2)2+HOTf, or from [Sn(NR2)(μ-Cl)]2+2AgOTf (R=SiMe3, −OTf=−OSO2CF3). The triflate ligand in the crystalline compound 1 binds to two tin atoms in an O,O′-bridging fashion (av. SnO 2.395(4) Å) and uses its third oxygen atom to bind more loosely to a tin atom of a neighbouring dinuclear tin unit [av. SnO″ 2.832(4) Å]. Multinuclear [1H-, 13C-, 19F- and 119Sn- (δ −78.0 in PhMeC6D6 at 298 K)] NMR and 119Sn Mössbauer (I.S. 3.37, Q.S. 3.75 mm s−1) spectral data are reported.