Homo- and Heteropolymetallic Complexes of the Hybrid, Ambidentate N‑Heterocyclic Carbene Ligand IMes-acac

• Published in: ACS omega 2018-11, Vol.3 (11), p.15582-15591
• Main Authors: César, Vincent, Mallardo, Valentina, Nano, Adela, DePeter, Sadie F, Bastin, Stéphanie, Sournia-Saquet, Alix, Maisse-François, Aline, Lugan, Noël, Bellemin-Laponnaz, Stéphane
• Format: Article
• Language: English
• Subjects: Chemical Sciences; Coordination chemistry
• ISSN: 2470-1343; 2470-1343
• DOI: 10.1021/acsomega.8b02268

The anionic 5-acetylimidazol-2-ylidene-4-olate 1 –, named as “IMes-acac”, is composed of fused diaminocarbene and acetylacetonato units in the same IMes-based imidazolyl ring. The bifunctional compound 1 – is shown to act as an effective, ditopic bridging ligand for transition metal centers. Several new complexes supported by this ligand were prepared, including the complex [RuCl­(p-Cym)­(κ2 O,O–1·H)]­(BF4) (2), which can be regarded as a metallated imidazolium salt, the homobimetallic complex [((COD)­Rh)­(RhCl­(COD))­(μ-1κ2 O,O:2κ1 C–1)] (4), the heterobimetallic complexes [((p-Cym)­ClRu)­(RhCl­(COD))­(μ-1κ2 O,O:2κ1 C–1)] (3), [((p-Cym)­ClRu)­(RhCl­(CO)2)­(μ-1κ2 O,O:2κ1 C–1)] (5), [((p-Cym)­ClRu)­(Cu­(IPr))­(μ-1κ2 O,O:2κ1 C–1)] (9), the anionic homoleptic Cu­(I) complexes [Cu­(κ1 C–1)2]K ([10]­K) and [Cu­(κ1 C–1)2]­(NEt4) ([10]­(NEt4)), and the heterotrimetallic complex [((p-Cym)­RuCl)2(Cu)­(μ-1κ2 O,O:3κ1 C–1)­(μ-2κ2 O,O:3κ1 C–1)]­(PF6) (11). Preliminary studies on the possible preparation of supramolecular metallopolymers and electrochemical studies on the series of complexes are also reported.