Homo- and Heterobimetallic Complexes Bearing NHC Ligands: Applications in α-Arylation of Amide, Suzuki-Miyaura Coupling Reactions, and Tandem Catalysis: Homo- and Heterobimetallic Complexes Bearing NHC Ligands: Applications in α-Arylation of Amide, Suzuki-Miyaura Coupling Reactions, and Tandem Catalysi