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Updated: Mar 13, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Single-Step Synthesis of Organometallic Molecular Squares from NR,NR',NR'',NR'''-Substituted Benzobiscarbenes
Narayan Sinha1, Florian Roelfes1, Alexander Hepp1
1Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149, Münster, Germany.
Abstract:
The single-step multicomponent self-assembly of molecular squares featuring four bridging benzobiscarbenes and four PdII (allyl) or IrI (COD) vertices is presented. Four equivalents of the linear benzobisimidazolium salt [1](PF6 )2 react with two equivalents of [Pd(allyl)Cl]2 or [IrCl(COD)]2 in the presence of Cs2 CO3 to yield the tetranuclear octacarbene molecular squares [2](PF6 )4 (M=Pd) and [3](PF6 )4 (M=Ir), respectively. Compounds [2](PF6 )4 and [3](PF6 )4 feature exclusively M-carbon bonds making them the first purely organometallic molecular squares.
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