| Abstract: Reaction of imidazole-4,5-dicarboxylic acid (H3IDC), 1,4-bis(imidazole-1-ylmethyl)benzene (bix) with ZnCl2 under hydrothermal condition, yielded a coordination polymer of {[Zn3(IDC)(bix)1.5Cl3]·0.25H2O}n (1) with two-fold interpenetrating 3D layered-pillared metal-organic framework architecture, which was structurally characterized by elemental analysis, infrared spectroscopy, thermal gravimetric analysis, and single-crystal X-ray diffraction. X-ray diffraction crystal structural analysis reveals its crystallizes in monoclinic system, space group P21/c with a=1.158 44(17) nm, b=1.088 75(16) nm, c=2.391 7(3) nm, β=96.835(2)°, V=2.995 1(8) nm3, Z=4, Dc=1.813 g·cm-3, F(000)=1 638, the final R1=0.037 9, and wR2=0.089 6 for 4 772 observed reflections with I>2σ(I). In complex 1, the interconnection of Zn(Ⅱ) ions by chelating and bridging μ4-IDC3- anions result in a 1D zigzag chain structure of [Zn3( μ4-IDC)Cl3]n. These adjacent 1D zigzag chains are further linked by cis-μ2-bix ligands to form a 2D network structure of [Zn3(IDC)(cis-μ2-bix)Cl3]n, which are further pillared by trans-μ2-bix ligands to generate a two-fold interpenetrating 3D layered-pillared framework of [Zn3( μ4-IDC)(cis-μ2-bix)(trans-μ2-bix)0.5Cl3]n. Furthermore, the luminescent property of complex 1 was also investigated at room temperature in the solid state. CCDC: 772778. |
