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Agostic interaction is a term, in organometallic chemistry, for the interaction of a coordinately-unsaturated transition metal with a C-H bond, when the two electrons involved in the C-H bond enter the empty d orbital of a transition metal, resulting in a two electron three center bond. . ...
en.wikipedia.org/wiki/Agostic

Describing a structure in which a hydrogen atom is bonded to both a carbon (or silicon) atom and a metal atom in a three-center, two-electron ...
en.wiktionary.org/wiki/agostic
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