The origins of the different bonding features in SiH5and CH5; a valence bond curve crossing model

Abstract
Valence bond (VB) computations reveal that the difference between the SiH5 and CH5 title species does not derive from the hypervalency associated with d atomic orbitals, but rather from the ability of Si to utilize efficiently its σ*(Si–H) orbitals for bonding, much more so than C with the σ*(C–H) orbitals, so that SiH5 possesses two H–Si–H axial bonds vs. only one such bond for CH5 .

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