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].