The reactions of the dibromosilanes Et2SiBr2, Ph2SiBr2, EtHSiBr2, PhHSiBr2 and MeHSiBr2 with N-methylimidazole (NMI) led to white powders stable at room temperature (with Et2SiBr2 an 1:2 adduct, with EtHSiBr2 and Ph2SiBr2 1:3 adducts, and with PhHSiBr2 and MeHSiBr2 1:4 adducts).
The compounds crystallize from solutions in chloroforme and acetonitrile. The X-ray single crystal investigations show in all five cases dicationic complexes.