Hydrothermal syntheses, crystal structure and luminescent properties of four zinc(II) coordination polymers based on tipodal imidazole

Four new Zn(II) coordination polymers [Zn(tib)2(H2O)2(NO3)2]n (1), [Zn(tib)2Cl2]n (2), [Zn(tib)(L1)]n (3) and [Zn(tib) (L2) (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 (44.610.8) topological symbol via hydrogen bonding interactions. Complex 2 shows a 2D (3,6)-connected topological net the Schläfli symbol of (43)2(46.66.83). 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.