Syntheses, Structures, and Photoluminescences of Four Cd(II) Coordination Architectures Based on 1-(4-Pyridylmethyl)-2-methylimidazole and Aromatic Carboxylates: From One-Dimensional Chain to Three-Dimensional Coordination Architecture

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Abstract

The use of 1-(4-pyridylmethyl)-2-methylimidazole (pmmid) combined with four kinds of benzenecarboxylic acid ligands has allowed the rational design of four novel Cd(II) coordination polymers (CPs), {[Cd(pmmid)(pa)(H2O)]·H2O}n (1), [Cd2(pmmid)2(cba)4] (2), [Cd1.5(pmmid)(tbba)3]n (3), and {[Cd(pmmid)(pma)0.5(H2O)]·5H2O}n (4), [H2pa = phthalic acid, Hcba = 4-chlorobenzoic acid, Htbba = 4-tert-butylbenzoic acid, and H4pma = pyromellitic acid], which were synthesized by reactions of Cd(OAc)2·2H2O and pmmid with aromatic acid under the ammoniacal condition and characterized by elemental analysis, infrared (IR) spectroscopy, powder X-ray diffraction (PXRD), and single crystal X-ray diffraction. Complex 1 possesses a one-dimensional (1D) chain architecture, complex 2 is an interesting 1D structure containing two kinds of 1D chains, complex 3 features a two-dimensional 63 topological network structure, and complex 4 is a novel three-dimensional coordination architecture framework containing a T4(2)10(2) water tape. In these complexes, the pmmid ligand takes a bidentate μ2-η1:η1 coordination mode, and the four benzenecarboxylate ligands are able to link Cd(II) ions in various coordination modes, giving these Cd(II) complexes with different structures. In addition, complexes 1–4 exhibit luminescence in the solid state at room temperature.

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