Synthesis of Rh-III and Ir-III Complexes Bearing Chelating Di-NHC Ligands Obtained from N9-Imidazolium-Substituted Adenine

摘要

The N9-imidazolium-substituted adenine derivative H-10 reacts with [MCl2(Cp*)](2) (M = Rh, Ir) in acetonitrile at 75 degrees C with formation of the C-NHC boolean AND N3(adenine) chelate complexes [3]Cl and [4]Cl, respectively. At higher temperature (125 degrees C), double deprotonation of H-1Cl by NaOAc was observed and the reaction with [MCl2(Cp*)](2) (M = Rh, Ir) yields the chelate complexes [5] and [6] bearing a unique C-NHC boolean AND C-azolato chelate ligand. The N7-protonation of the ring-nitrogen atoms of the azolato donor in [5] and [6] was also performed to give the complexes bearing a C-NHC boolean AND C-pNHC chelate ligand.