Low temperature NMR evidence shows the elusive siliconium ion is a further example of tautomeric equilibrium

Article abstract of DOI:10.1016/S0040-4039(00)76778-5

Compounds with a potentially pentacoordinated silicon central atom have been synthesized using a new tridentate ligand. Detailed NMR studies have shown, however, that, in contrast to an earlier report, each of these species exists in solution as an equili