Hydrothermal Synthesis,Crystal Structure and Properties of a Novel 3D Metal-organic Coordination Polymer with Helical Chains Based on 5-（Imidazol-1-ylmethyl）isophthalic Acid

A novel 3D metal-organic coordination polymer with helical chains based on a flexible 5-(imidazol-1-ylmethyl)isophthalic acid (H2L) as a main ligand and 1,2-bis(4pyridyl)ethane(bpa) as a N-containing ancillary ligand, [CdL(bpa)0.5]n (1), has been obtained under hydrothermal conditions and characterized by elemental analysis, powder X-ray diffraction (PXRD), IR, thermal gravimetric analyses (TGA) and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 10.984(2), b = 10.1829(12), c = 17.782(3) A, β = 123.156(11)o, V = 1665.1(5) A, Z = 4, Mr = 448.72, Dc = 1.790 g/cm, Rint = 0.0871, F(000) = 892, the final R = 0.0687 and wR = 0.1294 for 2920 observed reflections (I > 2σ(I)). In complex 1, the L anions connect Cd(II) ions to form two-dimensional metal-organic layers (Cd2L2)n, in which the 1D helical chains (Cd-L)n are alternately arranged in a rightand left-handed sequence. These layers are further linked to build a 3D network by the bpa ligand. In addtion, photoluminescent properties for 1 are also investigated.

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