Structure of N,C,N-chelated organotin(IV) fluorides

The set of starting tri-, di- and monoorganotin(IV) halides containing N,C,N-chelating ligand (LNCN = {1,3-[(CH3)2NCH2]2C6H3}−) has been prepared (1–5) and two compounds structurally characterized ([LNCNPh2Sn]+I3− (1c), LNCNSnBr3 (5)) in the solid state. These compounds were reacted with KF with 18-crown-6, NH4F or LCNnBu2SnF to give derivatives containing fluorine atom(s). Triorganotin(IV) fluorides LNCNMe2SnF (2a) and LNCNnBu2SnF (3a) revealed monomeric structural arrangement with covalent Sn–F bond both in the coordinating and non-coordinating solvents, except the behaviour of 3a that was ionized in the methanol solution at low temperature. The products of fluorination of LNCNSnPhCl2 (4) and 5 were described by NMR in solution as the ionic hypervalent fluorostannates or the oligomeric species reacting with chloroform, methanol or moisture to zwitterionic monomeric stannate LNCN(H)+SnF4− (5c), which was confirmed by XRD analysis in the solid state.