A neutral vicinal silylene/phosphane supported six-membered CPSiAu ring and a silver(I) complex.

This work presents the different coordination nature of the bidentate ligand towards gold and silver complexes. The reaction of 1 with AuClSMe in dichloromethane resulted in two gold atoms containing six-membered ring PhC(NBu)Si-Au⋯Au-PPhCH (2). Compound 2 exhibits intramolecular aurophilic interaction (2.9987(7) Å), which is further supported by quantum chemical calculations. Moreover, the reduction of aluminium adduct 3 with AgSbF affords insertion of silver cation [{PhC(NBu)SiF}-CH(PPh)-Ag-(PPh)CH{PhC(NBu)SiF}]AlCl (4) between two phosphane. In compound 4 only two P(III) of two molecules of 1 coordinates to Ag(I), while two Si(II) remains uncoordinated and gives oxidative addition of Fluorine.