NHC Pd(II) and Ag(I) Complexes: Synthesis, Structure, and Catalytic Activity in Three Types of C-C Coupling Reactions.

Four bis-benzimidazolium salts, 1,4-bis[1'-(-R-benzimidazoliumyl)methyl]-2,3,5,6-tetramethylbenzene 2X ( : R = ethyl, X = PF; : R = picolyl, X = Br; : R = benzyl, X = Br; and : R = allyl, X = Br), and their three -heterocyclic carbene (NHC) Pd(II) and Ag(I) complexes, (), (), and (), as well as one anionic complex (), have been synthesized and characterized. Complex adopts a funnel-like type of structure, complex adopts a cyclic structure, and complex is an open structure. In the crystal packing of -, one-dimensional polymeric chains and two-dimensional supramolecular layers are formed via intermolecular weak interactions, including hydrogen bonds, π-π interactions, and C-H···π contacts.