The d10 metal-sulfosalicylate complexes: Herring-bone, ladder and double-stranded chain frameworks with green luminescences

Abstract

Assembly of 5-sulfosalicylic acid (H 3L) and d 10 transition metal ions (Cd II, Ag I) with the neutral N-donor ligands produces five new complexes: [Cd 2(HL) 2(4,4′-bipy) 3] n ·2 nH 2O ( 1), {[Cd 2( μ 2-HCO 2) 2(4,4′-bipy) 2(H 2O) 4][Cd(HL) 2(4,4′-bipy)(H 2O) 2]} n ( 2), {[Cd(4,4′-bipy)(H 2O) 4][HL]·H 2O} n ( 3), [Cd(HL)(dpp) 2(H 2O)] n ·4 nH 2O ( 4), {[Ag(4,4′-bipy)][Hhbs]} n ( 5) (4,4′-bipy=4,4′-bipyridine, dpp=1,3-di(pyridin-4-yl)propane, H 2hbs=4-hydroxybenzenesulfonic acid, the decarboxylation product of H 3L). Complex 1 adopts a 5-connected 3D bilayer topology. Complex 2 has the herring-bone and ladder chain, which are extended to a 3D network via hydrogen bonding. In 3–4 complexes, 3 is a 3D supermolecular structure formed by polymeric chains and 2D network of HL 2−, while 4 gives the double-stranded chains. In 5, ladder arrays are stacked with the 2D networks of Hhbs − anions in an –ABAB– sequence. Complexes 1–4 display green luminescences in solid state at room temperature, while emission spectra of 3 and 4 show obvious blue-shifts at low temperature.