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| The title complex, [[Cd(Him)(OH-BDC)(H2O)2]•3H2O]n (1) (Him = imidazole, OH-H2BDC = 5-hydroxyisophthalic acid), was synthesized by liquid/liquid diffusion method at room temperature. The complex crystallizes in orthorhombic, space group P2(1)2(1)2(1), with a = 6.7160(7), b = 13.8055(14), c = 17.4205(18) Å, V = 1615.2(3) Å3, C11H18CdN2O10, Mr = 450.67, Dc = 1.853 g/cm3, μ = 1.407 mm−1, F(000) = 904, Z = 4, the final R = 0.0209 and wR = 0.0453 for 3211 observed reflections (I >2σ(I)). In the structure of 1, the OH-BDC ligands exhibiting bis-bidentate coordination mode bridge the adjacent Cd centers to form a one-dimensional helical chain and the second ligand Him acting as terminal ligands are attached to the helical chain. It is notable that a series of complicated hydrogen bonds (eg: N—H•••O, O—H•••O) exist in the structure, which link neighboring helices into a three-dimensional supramolecular architecture. An observed intense blue luminescence with an emission band peaking at 390 nm for 1 may resulted from ligand-to-metal charge transfer (LMCT). |
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| Keywords:Mixed-ligand, Helix, Hydrogen bonds, Luminescence |
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