Synthesis, properties, and X-ray crystal structures of two Ag(I) complexes with 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid

Two 1-D and 3-D Ag(I) complexes involving 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid (H3PIDC) have been characterized by infrared spectrum, elemental analysis, and single-crystal X-ray diffraction. [Ag-2(HPIDC)](n) (1), synthesized under hydrothermal conditions, gave a 3-D framework; [Ag-2(HPIDC)(MBI)](n) (2) (MBI=2-methyl-1H-benzo[d]imidazole), with MBI as the second ligand, gave a 1-D zigzag chain and further formed a 3-D supramolecular structure through interactions. The most interesting structural features of these complexes are the presence of C-HAg hydrogen bonding interactions and AgC weak interactions between the Ag centers and H3PIDC. Luminescence indicates that 2 has significantly stronger fluorescent emissions than 1 in the solid state at room temperature.