Supramolecular architectures constructed on the skeleton of Silver nitrate, 4,4′-bipyridine and triphenylphosphine/1,2-bis(diphenylphosphino)ethane: Synthesis, structural characterization and non-covalent interactions

In the presence of PPh3 and Ph2PCH2CH2PPh2 (dppe); AgNO3 and 4,4′-bipyridine (bpy) react to form [Ag(PPh3)(bpy)1/2(ONO2)]n (1) and [Ag(dppe)1/2(bpy)1/2(ONO2)]n (2). The compositions of these complexes are supported by their elemental analysis. The structures are determined by spectroscopic (IR, 1H NMR, UV–Vis) and X-ray crystallographic data. A zig-zag ladder type structure observed in 1 changes into straight ladder type structure in 2 in which [Ag(dppe)1/2(ONO2)]n chains are bridged by bpy with Ag⋯Ag distance of 11.48 Å. However in 1, the two zig-zag chains are linked via π–π interactions at 3.82 Å between phenyl rings of terminal PPh3 ligands. Both complexes luminesce in DMSO solution. Photoluminescence of a representative complex 2 is also measured.