Syntheses and crystal structures of five two-dimensional networks constructed from staircase-like silver(I) thiocyanate chains and bridging polyamines

Abstract

Five co-ordination polymers ²_∞[(AgSCN)₂L] (L = 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane or 1,5-diaminopentane) and ²_∞[(AgSCN)₃L] (L = N,N′-bis(3-aminopropyl)ethylenediamine) have been synthesized and structurally characterised by single-crystal X-ray diffraction. Each complex contains one-dimensional staircase-like ¹_∞[(AgSCN)₂] chains in which each thiocyanate ligand acts in the μ-N,S,S-bridging mode. Every silver(I) atom in the staircase-like chain is further co-ordinated by a terminal nitrogen atom of the amine ligand to furnish a highly distorted AgN₂S₂ tetrahedral geometry. Both ends of the amine ligands participate in co-ordination, extending the one-dimensional staircase-like ¹_∞[(AgSCN)₂] chains to two-dimensional staircase-like or square-wave like ²_∞[(AgSCN)₂L] networks in 1–4, whereas adjacent chelating ethylenediamine entities of the amine ligands in 5 are further interlocked with the Ag₂(μ-S-SCN)₂ dinuclear cores, resulting in a different formula ²_∞[(AgSCN)₃L].