Coordination networks constructed with the multinuclear silver–ethynide supramolecular synthon 4-nitrophenyl–CC⊃Agn (n = 3, 4, 5)

Abstract

A series of thirteen new silver(I) double and multiple salts containing 4-nitrophenylethynide (L), namely AgL·4AgCF₃COO·CH₃CN (1), AgL·5AgCF₃COO·3CH₃CN (2), 3AgL·4AgCF₃COO·2CH₃CN (3), 3AgL·7AgCF₃COO·6CH₃CN (4), AgL·3AgC₂F₅COO·CH₃CN (5), 4AgL·4AgC₃F₇COO·3CH₃CN (6), 2AgL·4AgCF₃COO·NC(CH₂)₂CN (7), AgL·3AgCF₃COO·CH₃CN·0.5NC(CH₂)₄CN (8), AgL·3AgC₂F₅COO·CH₃CN·NC(CH₂)₄CN (9), 4AgL·12AgCF₃COO·4(m-NCC₆H₄CN)·H₂O (10), AgL·2[CF₂(CF₂COOAg)₂]·4.5H₂O (11), AgL·CF₂(CF₂COOAg)₂·AgCF₃COO·H₂O (12) and AgL·CF₂(CF₂COOAg)₂·AgC₂F₅COO·H₂O (13), have been synthesized and characterized by X-ray crystallography. All these compounds contain the multinuclear silver–ethynide supramolecular synthon R–CC⊃Ag_n (R = 4-nitrophenyl; n = 3, 4, 5). High-dimensional metal–organic frameworks are achieved in these complexes via the linkage of characteristic carboxylate-bridged infinite silver chains by nitro–silver coordination or weak interactions. In addition, the nitrophenyl group exhibits its versatile ability to form other intermolecular interactions such as nitro⋯nitro, π⋯π, and C–H⋯O hydrogen bonding to stabilize the network structure. Furthermore, several factors affecting the supramolecular architectures, including the incorporation of nitriles and/or bidentate perfluorocarboxylates as co-existing ligands are also discussed.