Supramolecular silver(i) coordination isomers of different dimensionalities assembled using a conformationally flexible multidentate oligo-α-sulfanylpyrazinyl ligand

Abstract

Three genuine supramolecular isomers and one homologous complex based on a conformationally flexible multidentate 2,6-bis(pyrazin-2-ylthio)pyrazine (L) ligand, namely α-[Ag(L)ClO₄]_n (1a), β-[Ag(L)ClO₄]_n (1b), γ-[Ag(L)ClO₄]_n (1c) and [Ag₂(L)₃(ClO₄)₂·2H₂O]_n (2), have been synthesized and structurally characterized by single-crystal X-ray diffraction analyses. Isomers 1a–1c feature a chain, a sheet and a three-dimensional framework, respectively. Compound 2 shows a ladder-like structure with an unusual zigzag water chain. In these complexes, ligand L exhibits four distinct coordination modes and stereochemical conformations, and their effects on the formation of supramolecular isomers are discussed in detail.