Syntheses and structures of three two-dimensional silver(I)–hexamethylenetetramine co-ordination polymers with new topological motifs

Abstract

Three new co-ordination complexes, [Ag(μ-hmt)(cin)]·2H₂O 1, [Ag₂(μ₃-hmt)(sal)₂] 2, and [Ag₂(μ-hmt)(μ₃-hmt)(ssa)] 3 (hmt = hexamethylenetetramine (1,3,5,7-tetraazatricyclo[3.3.1^3,7]decane), cin = cinnamate, sal = salicylate and ssa = 5-sulfosalicylate), have been prepared and structurally characterised. All of these complexes contain different new topological motifs of two-dimensional Ag–hmt nets. Among them, 1 has two-dimensional infinite co-ordination layers featuring compressed hexagonal units each consisting of six Ag(I) and four μ-hmt ligands as spacers. 2 has two-dimensional infinite wavy co-ordination layers with decagonal and small hexagonal units; each decagonal unit comprises six Ag(I) and four μ₃-hmt ligands, and each small hexagonal unit comprises four Ag(I) and two μ₃-hmt ligands. 3 has two-dimensional infinite highly undulated Ag–hmt layers with irregular decagonal units each consisting of five Ag(I), two μ-hmt and three μ₃-hmt ligands.