Influence of anionic sulfonate-containing and nitrogen-containing mixed-ligands on the structures of silver coordination polymers

Abstract

In this article, a series of mixed-ligand Ag(i) coordination polymers, namely, Ag(L1)H(2)O (), Ag(2)(hmt)(2)(L1)(2) (), [Ag(HL2)]H(2)O (), [Ag(L2)(biim)][Ag(biim)] (), [K(5)(L3)(2)][Ag(H(2)O)(2)] (), [Ag(2)(L3)(3-iso)][Ag(3-iso)]5H(2)O (), [Ag(3)(L3)(bipy)(3)(H(2)O)]6H(2)O (), [Ag(3)(L3)(biim)(3)]H(2)O (), and [Ag(3)(L3)(hmt)(2)(H(2)O)(3)]H(2)O () (where hmt = hexamethylenetetramine, bipy = 4,4'-bipyridine, biim = 1,1'-(1,4-butanediyl)-bis(imidazole), 3-iso = 3-methylisoquinoline, L1 = 2,5-dichloro-4-amino-benzenesulfonate anion, L2 = 2-nitroso-1-naphthol-4-sulfonate anion and L3 = 4-hydroxy-5-nitro-1,3-benzenedisulfonate anion), have been synthesized by varying the anionic sulfonate-containing ligands and nitrogen-containing secondary ligands. Compounds and were synthesized through their parent compounds and , respectively, while were obtained by their parent compound . Ag(i) centers of are linked by L1 anions to generate a 1D polymeric chain, while Ag(i) centers of are bridged by hmt ligands to form a 2D polymeric layer. In , Ag(i) centers are connected by L2 anions to yield a 1D double chain, whereas Ag(i) centers in are joined by biim ligands and L2 anions, generating an unusual anionic chain and a cationic chain, respectively. In , Ag(i) centers are coordinated by water molecules, and K(i) cations are coordinated by L3 anions to form a pillared layered structure with inorganic layers and organic pillars. In , Ag(i) centers are coordinated by 3-iso ligands and L3 anions to generate a discrete molecular structure. In , bipy ligands bridge Ag(i) centers to give Ag-bipy chains, which are further linked by L3 anions to produce a 2D polymeric layer. In , Ag(i) centers are bridged by biim ligands to generate a 1D polymeric chain. In , the hmt ligands connect Ag(i) centers to give a binodal (3,4)-connected net with (6(3))(6(5).8)(2) topology. These results indicate that anionic sulfonate-containing ligands and the nitrogen-containing secondary ligands play important roles in the structural formation of the Ag(i) complexes. Additionally, the luminescent properties, elemental analyses and IR spectroscopy of these compounds were also studied.