Unsupported Gold(I)−Copper(I) Interactions through η¹_Au-[Au(C₆F₅)₂]^- Coordination to Cu⁺ Lewis Acid Sites

The reaction of the complex [Au2Ag2(C6F5)4(N⋮CCH3)2]n (1) with 1 equiv of CuCl in the presence of 1 equiv of pyrimidine ligand leads to the formation of the heteronuclear Au(I)−Cu(I) organometallic polymer [Cu{Au(C6F5)2}(N⋮CCH3)(μ2-C4H4N2)]n (2) through a transmetalation reaction. Complex 2 displays unprecedented unsupported Au(I)···Cu(I) interactions of [Au(C6F5)2]- units with the acid Cu(I) sites in a [Cu(N⋮CCH3)(μ2-pyrimidine)]n+n polymeric chain. Complex 2 has a rich photophysics in solution and in the solid state.