Syntheses, structures and properties of silver(I) complexes constructed from nitrogenous aromatic heterocyclic carboxylic acids and N-donor ligands

• Four new Ag-containing complexes are obtained.
• The complexes are based on nitrogenous aromatic heterocyclic carboxylic acids.
• The complexes are extended to high-dimensional supramolecular networks.
• The complexes exhibit fluorescent properties in the solid state.

Four new coordination complexes with silver(I) ions and nitrogenous aromatic heterocyclic carboxylic ligands, namely [Ag4(pztc)(phen)4] · 8H2O (1), {[Ag4(pztc)(bpe)3] · 5H2O}n (2), [Ag4(Hmptc)2(4,4′-bpy)3] · 4.5H2O (3), and [Ag2(H2mptc)2(2,2′-bpy)2] (4) (H4pztc = pyrazine-2,3,5,6-tetracarboxylic acid, H3mptc = 6-methyl-2,3,5-pyridine-tricarboxylic acid, phen = 1,10-phenanthroline, bpe = trans-1,2-bis(4-pyridyl)ethylene, 4,4′-bpy = 4,4′-bipyridine, 2,2′-bpy = 2,2′-bipyridine), have been synthesized by the self-assembly reactions and characterized by X-ray diffraction single crystal structure analysis, elemental analysis, IR, PXRD, fluorescence and thermal analysis. In 1, four crystallographically independent silver(I) atoms are found to coordinate with only one pztc4 − ligand. Complex 2 is a 2D grid structure. Complexes 3 and 4 are extended from 0D to 2D or 1D by the Ag⋯O interactions.

Four Ag-containing complexes constructed from mixed ligand of pyrazine-2,3,5,6-tetracarboxylic acid (H4pztc) or 6-methyl-2,3,5-pyridinetricarboxylic acid (H3mptc) and N-donor ligands are designed and synthesized. Notably, H2O/ethanol/acetonitrile conditions have been the preferred method employed by our group to enhance the solubility of the silver carboxylates, which provide a new way of Ag complex synthesis.Figure optionsDownload as PowerPoint slide