Influence of anionic sulfonate-containing co-ligands on the solid structures of silver complexes supported by 4,4′-bipyridine bridges

Abstract

In this paper, ten new silver compounds, namely [Ag(bipy)](L1)·H₂O (1), [Ag(bipy)](L2)·2H₂O (2), [Ag₂(bipy)₂(H₂O)₂](L3)·H₂O (3), [Ag(L4)(bipy)]·H₂O (4), [Ag(L5)(bipy)] (5), [Ag(L6)(bipy)]·0.5CH₃CN (6), [Ag₃(L7)₂(bipy)₂]·2(H₂O) (7), [Ag₂(L8)(bipy)_1.5(H₂O)]·H₂O (8), [Ag₂(L9)(bipy)₂(H₂O)₂] (9) and [Ag₃(L10)(bipy)₂][(bipy)(H₂O)₂]·(H₂O)_3.5 (10) (where bipy = 4,4′-bipyridine, L1 = 6-amino-1-naphthalenesulfonate anion, L2 = 2-naphthalenesulfonate anion, L3 = sulfosalicylate anion, L4 = p-aminobenzenesulfonate anion, L5 = 4-dimethyaminoazobenzenen-4′-sulfonate anion, L6 = 2,5-dichloro-4-amino-benzenesulfonate anion, L7 = 8-hydroxyquinoline-5-sulfonate anion, L8 = 2-nitroso-1-naphthol-4-sulfonate anion, L9 = 2,6-naphthalenedisulfonate anion and L10 = 1,3,5-naphthalenetrisulfonate anion), have been synthesized and characterized by elemental analyses, IR spectroscopy and X-ray crystallography. In compounds 1–6, Ag(I) centers are linked by bipy ligands to form 1D Ag–bipy chain structures, in which the sulfonate anions of compounds 1–3 act as counter ions. The sulfonate anions of compounds 4 and 5 connect Ag–bipy chains to form 1D double chain structures, respectively. The sulfonate anions of compound 6 connect Ag–bipy chains to form a 2D layer structure. Unexpectedly, compound 7 shows a hinged chain structure, and these chains interlace with each other through hydrogen bonds and π–π interactions to generate a 3D structure with channels along the c axis. Compounds 8 and 9 show 1D ladder-like structures. In compound 10, the Ag–bipy chains are connected by sulfonate anions to generate a 3D poly-threaded network, in which an isolated Ag–bipy chain is inserted. The results indicate that the anionic sulfonate-containing co-ligands play an important role in the final structures of the Ag(I) complexes. Additionally, the luminescent properties of these compounds were also studied.