Going Beyond σ Complexation: Nonclassical Interligand Interactions of Silyl Groups with Two and More Hydrides

Dominated for two decades by agostic and σ complexes, the family of complexes with nonclassical interligand interactions is rapidly extending to include new types of compounds. Multicenter (H)2⋅⋅⋅Si and (H)3⋅⋅⋅Si interactions have recently been documented in transition metal silicon chemistry (see scheme).