Structural diversity and luminescence properties of the novel {[Cd3(TBIB)4(BTC)2]•2C2H5OH•11H2O}n and {[Zn(TBIB)(HBTC)]•3H2O}n coordination polymers

By using the tripodal ligand 1,3,5-tri(1H-benzo[d]imidazol-1-yl)benzene (TBIB) and the carboxylate donor ligand 1,3,5-benzenetricarboxylic acid (H3BTC), two new coordination polymers, {[Cd-3(TBIB)(4) (BTC)(2)]center dot 2C(2)H(5)OH center dot 11H(2)O}(n) (1) and {[Zn(TBIB)(HBTC)]center dot 3H(2)O}(n) (2), have been obtained under solvothermal conditions. Characterization has been done through X-ray crystallography, IR spectroscopy, thermogravimetry and elemental analysis. Complex 1 displays a novel three dimensional (3D) (3,3,3,3,4,5,5)-connected 7-nodal net with a unique (4.5.6.7(2).8(3).9(2)}{4.5.7}{4.5(2).8(3)){4.6.7}{4.8(2))(2){4(2).5(2).83(3).9(3)} topology while compound 2 reveals a 1D ladder structure which is further extended into a 3D supramolecular architecture through non-covalent hydrogen bonding, C-H center dot center dot center dot pi and O-H center dot center dot center dot pi interactions, consisting of a 3-connected SP1-periodic net with the point symbol {4(2).6}. The metal-free ligand TBIB exhibits strong fluorescence, while this is quenched in both coordination polymers. (C) 2014 Elsevier Ltd. All rights reserved.