Homo- and Heteropolymetallic Complexes of the HybridAmbidentate N-Heterocyclic Carbene Ligand IMes-acac

摘要

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)(κ²O,O–>1·H)](BF4) (>2), which can be regarded as a metallated imidazolium salt, the homobimetallic complex [((COD)Rh)(RhCl(COD))(μ-1κ²O,O:2κ¹C–>1)] (>4), the heterobimetallic complexes [((p-Cym)ClRu)(RhCl(COD))(μ-1κ²O,O:2κ¹C–>1)] (>3), [((p-Cym)ClRu)(RhCl(CO)2)(μ-1κ²O,O:2κ¹C–>1)] (>5), [((p-Cym)ClRu)(Cu(IPr))(μ-1κ²O,O:2κ¹C–>1)] (>9), the anionic homoleptic Cu(I) complexes [Cu(κ¹C–>1)2]K ([>10]K) and [Cu(κ¹C–>1)2](NEt4) ([>10](NEt4)), and the heterotrimetallic complex [((p-Cym)RuCl)2(Cu)(μ-1κ²O,O:3κ¹C–>1)(μ-2κ²O,O:3κ¹C–>1)](PF6) (>11). Preliminary studies on the possible preparation of supramolecular metallopolymers and electrochemical studies on the series of complexes are also reported.