Hydrothermal syntheses, crystal structure and luminescent properties of four zinc(II) coordination polymers based on tipodal imidazole
摘要:
Four new Zn(II) coordination polymers [Zn(tib)(2)(H2O)(2)(NO3)(2)](n) (1), [Zn(tib)(2)Cl-2](n) (2), [Zn(tib)(L-1)](n) (3) and [Zn(tib) (L-2) (H2O)](n) (4) [tib = 1,3,5,-tris(1-imidazolyl) benzene, H2L1 = 5-hydroxyisophthalic acid and H2L2 = 5-methylisophthalic acid] have been prepared and characterized by elemental, IR, XRPD and X-ray diffraction analyses. The structure determination reveals that complex 1 is a 2D layer network and exhibits a typical (4,4)-topological net, which further assembles into a 3D (3,6)-connected framework with (4(4).6(10).8) topological symbol via hydrogen bonding interactions. Complex 2 shows a 2D (3,6)-connected topological net the Schlafli symbol of (4(3))(2)(4(6).6(6).8(3)). Complex 3 features a (4,4)-topological net and further assembles into a 3D pcu framework by hydrogen bonding interactions. Complex 4 is a 1D ladder-like chains structure. Furthermore, the photoluminescence properties are investigated. (C) 2013 Elsevier B.V. All rights reserved.