Different coordination modes of the thiosaccharinate anion in dinuclear and one dimensional polymeric silver–azine complexes

The effect of substituted pyridines bases upon the coordination of thiosaccharinate (tsac, C7H4NO2S2− in ternary silver complexes is analyzed. Four crystalline silver-substituted pyridine complexes with tsac as a coordinating counter anion, [Ag(tsac)(3-methylpyridine)2]n, [Ag2(tsac)2(4-methylpyridine)]n, [Ag2(tsac)2(quinoline)2] and [Ag(tsac)(4-methyloxypyridine)]n were synthesized and characterized by means of spectroscopic (IR and Raman, UV–Vis, and 1H and 13C NMR) and X-ray diffraction techniques. The thiosaccharinate anion showed its versatility coordinating to the metal in each complex by a different way. In the 3-Mepy complex it was coordinated in a μ2-S mode and in the 4-MeOpy complex it was bound in a μ3-S form both resulting in polymeric chains. In the 4-Mepy complex the anion was bound in a μ2-S,N head to head mode and in the quinoline complex in a μ2-S,N head to tail mode, both showing dinuclear arrangements.

Substituted pyridine ligands were used to obtain four new dinuclear or polynuclear silver(I) thiosaccharinates. Small changes in the nitrogenated ligand led to huge variations in the structures of the obtained complexes. The dinuclear compounds show ligand assisted argentophilic interactions.Figure optionsDownload as PowerPoint slide