Novel μ₅-coordination modes of aryl and alkyl ethynides and classification of metal-ligand interactions in silver(I) complexes

Novel μ₅-η¹,η¹, η¹,η¹,η² and μ₅- η¹,η¹,η¹,η², η² coordination modes of alkyl and aryl ethynide moieties are found in silver(I) complexes 1-5, and the metal-ligand distances can be classified into σ, π and mixed (σ,π) types. With the consistent square-pyramidal capping Ag₅ baskets of the ethynide moiety as supramolecular synthons, a series of two- and three-dimensional coordination networks are obtained.