Possible Synthetic Approaches for Heterobimetallic Complexes by Using nNHC/tzNHC Heteroditopic Carbene Ligands

Possible Synthetic Approaches for Heterobimetallic Complexes by Using nNHC/tzNHC Heteroditopic Carbene Ligands

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The synthesis of heterobimetallic complexes remains a synthetic challenge in the field of organometallic chemistry.A possible approach in this regard might be the use of a bidentate heteroditopic bis(carbene) ligand that combines an imidazol-2-ylidene (nNHC) with a 1,2,3-triazol-5-ylidene (tzNHC) connected by an organic spacer.The optimized strategy to heterobimetallic complexes with this type of ligand involves a 3-step procedure: Wooden Shape Sorting (i) Coordination of the nNHC, functionalized with a 1,2,3-triazole ring, to a metal center; (ii) formation of the triazolium ring by alkylation of the triazole N-3; (iii) deprotonation of the tzNHC precursor and coordination of the second metal center.

Following this procedure, a novel Au(I)-Ag(I) dinuclear complex was isolated and its properties were compared to the analogous homobimetallic skateboards Ag(I)-Ag(I) and Au(I)-Au(I) complexes.The study was completed by the determination of the molecular structures of some synthetic intermediates.