Hydrothermal synthesis,structure, and photoluminescence of four complexes based on 1H-imidazole-4,5-dicarboxylate or 1H-imidazole-2-carboxylate ligands

Four complexes, [Ag₄(bipy)₂(Himdc)₂(H₂O)₂] _n (1), [Ag(H₂imdc)] _n (2), [K(H₃imdc)(H₂imdc)(H₂O)₂] _n (3), and [Cu(Himc)₂] (4) (H₃imdc?=?1H-imidazole-4,5-dicarboxylic acid, H₂imc?=?1H-imidazole-2-carboxylic acid, and bipy?=?4,4′-bipyridine), were hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis and elemental analysis. The obtained complexes exhibit different coordination structures; 1 contains a 2-D supramolecular layer based on two chains arraying uniformly in an ABAB manner. Compound 2 displays sawtooth-shaped 1-D chains extending to 2-D layers via hydrogen bond interactions. Compound 3 possesses a 3-D framework structure based on a 1-D chain via hydrogen bonding interactions. Compound 4 has a 3-D framework structure bearing a pcu-type topology. In addition, the photoluminescence for 1 has been investigated.