Macrocyclic silver and gold complexes containing bis (N-heterocyclic carbene) ligand: Synthesis and structural characterization

Silver and gold complexes, [Ag2(L)2](PF6)2 and [Au2(L)2](PF6)2, supported by but-2-yne-1,4-diyl linked bis(N-heterocyclic carbene) ligand have been prepared and structurally characterized. The complexes display novel twisted macrocyclic conformation and weak intramolecular metal–metal interaction. The complexes are intensely emissive in their solid states.