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 {[Zn-3(IDC)(bix)(1.5)Cl-3]center dot 0.25H(2)O}(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 P2(1)/c with a=1.158 44(17) nm, b=1.088 75(16) nm, c=2.391 7(3) nm, beta=96.835(2)degrees, V=2.995 1(8) mm(3), Z=4, D-c=1.813 g.cm(-3), F(000)=1 638, the final R-1=0.0379, and wR(2)=0.089 6 for 4 772 observed reflections with I>2 sigma(I). In complex 1, the interconnection of Zn(II) ions by chelating and bridging mu(4)-IDC3- anions result in a 1D zigzag chain structure of [Zn-3(mu(4)-IDC)Cl-3](n). These adjacent ID zigzag chains are further linked by cis-mu(2)-bix ligands to form a 2D network structure of [Zn-3(IDC)(cis-mu(2)-bix)Cl-3], which are further pillared by trans-mu(2)-bix ligands to generate a two-fold interpenetrating 3D layered-pillared framework of [Zn-3(mu(4)-IDC)(cis-mu(2)-bix)(trans-mu(2)-bix)(0.5)Cl-3](n). Furthermore, the luminescent property of complex 1 was also investigated at room temperature in the solid state. CCDC: 772778.