Syntheses, crystal structures, and fluorescent properties of two Cd(II) complexes based on 2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4,5-dicarboxylic acid)

Two new complexes, [Cd2(H4ebidc)2(CH3OH)4] · 2CH3OH (1) and {[Cd(Cl)(I)(H6ebidc)1/2] · 1/2bbe · H2O} n (2) (H6ebidc = 2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4,5-dicarboxylic acid), bbe = 1,2-bis(2-benzimidazolyl)ethane), are obtained through self-assembly of H6ebidc with Cd(II). Single-crystal X-ray diffraction shows that 1 has a binuclear structure and each tridentate chelating ligand coordinates to two Cd(II) ions with µ2-O. Complex 2 displays a 1-D chain structure and each tetradentate ligand bridges two Cd(II) ions in chelating fashion. Fluorescent properties have also been determined.