What question did this study set out to answer?

The aim is to synthesize longer inorganic chains of sp-hybridized atoms in bimetallic complexes without carbon.

March 19, 2026

Bimetallics Spanned by Linear All-Inorganic Ligands: The Longest Inorganic, All- sp Chains

Key Points

The aim is to synthesize longer inorganic chains of sp-hybridized atoms in bimetallic complexes without carbon.
Utilized 1,3-haloboration of the [WNN] fragment
Synthesis of homo- and heterobimetallic complexes
Structural confirmation of complex with six-atom all-sp bridging ligand
Constructed the longest sp-hybridized inorganic chain to date
Confirmed structural integrity of bimetallic complexes
Demonstrated feasibility of longer inorganic sp chains without carbon

Abstract

The construction of longer chains of sp-hybridized atoms, while relatively facile for carbon, is essentially unknown in the absence of carbon. Our recent results with the 1, 3-haloboration of the WNN fragment of a Chatt-type complex are herein utilized in the synthesis of homo- and heterobimetallic complexes spanned by long all-inorganic sp chains. Notably, this includes structural confirmation of the longest sp-hybridized inorganic chain ever constructed, in a bimetallic complex with a six-atom all-sp NNBBNN bridging ligand.

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