Niobocene mono- and bis(silyl) hydrides with dimethylhalosilyl groups exhibit a nonclassical interligand hypervalent interaction (IHI) between the hydride and silyl ligands. These interactions result in well-defined structural and reactivity trends and were found in two forms: three-centre, four-electron (A) and five-centre, six-electron (B), as shown schematically.
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Nikonov et al. (1999) studied this question.