Synthesis,Structure,and Luminescent Property of a Two-Fold Interpenetrating 3D Zn(II),Coordination Polymer Constructed from Imidazole Derivatives

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 I2σ(I).In complex 1,the interconnection of Zn,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.