bent sandwich compound

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June 22, 2026

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Bent sandwich compounds are a type of organometallic compound where two organic ring systems are bonded to a metal atom, but the rings are not parallel, creating a "bent" structure. This contrasts with "sandwich compounds" like ferrocene, where the rings are parallel.12

These compounds are significant in the organometallic chemistry of early and middle transition metals, as well as f-block elements like lanthanoids and actinoids. To achieve stability with f-block elements, a pentamethylcyclopentadienyl ligand is often used. An example is the Schrock carbene Ta(η⁵-C₅H₅)₂(CH₃)(CH₂), which is a bent sandwich compound.1

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organometallic compound
Cyclic polyene ligands
…closely related set of so-called bent sandwich compounds, in which the Cp rings are not parallel, are important in the organometallic chemistry of the early and middle d-block elements and the f-block elements (lanthanoids and actinoids). The Schrock carbene Ta(η⁵-C₅H₅)₂(CH₃)(CH₂), shown above, is one such example. Bent sandwich compounds are
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…closely related set of so-called bent sandwich compounds, in which the Cp rings are not parallel, are important in the organometallic chemistry of the early and middle d-block elements and the f-block elements (lanthanoids and actinoids). The Schrock carbene Ta(η⁵-C₅H₅)₂(CH₃)(CH₂), shown above, is one such example. Bent sandwich compounds are
Read More