Effect of substituent carboxylic group on the self-assembly of cadmium coordination polymers: Syntheses, topological analyses and photoluminescence properties

Two coordination polymers, formulated as {[Cd(1,4-BDC)(PPene)]center dot CH3CN}(n) (1) and [Cd(H2O) (1,2,4-HBTC)(ppene)(0.5)](n) (2) have been synthesized through the solvothermal reactions between Cd(NO3)(2)center dot 4H(2)O and 4-pyr-poly-2-ene (ppene) in the presence of 1,4-benzenedicarboxylic acid (1,4-H2BDC) or its derivative 1,2,4-benzenetricarboxylic acid (1,2,4-H3BTC). These two compounds were structurally characterized by infrared spectroscopy, elemental analysis, single crystal X-ray diffraction and powder X-ray diffraction. Compound 1 exhibits a three-dimensional two-fold interpenetrating 4(12)6(3)-pcu network. The coordination network of 2 shows a three-dimensional (4,5)-connected framework with rare (4(4)6(2)) (4(4)6(8)) tcs topology. Owing to the linkage of hydrogen bonding interactions between protonated carboxylic groups, 2 further displays a three-dimensional (5,5)-connected supramolecular network with an unprecedented Schlafli symbol (4(8)6(2))(4(6)6(4)). Thermal stability and photoluminescence properties of 1 and 2 were also investigated. (C) 2015 Elsevier B.V. All rights reserved.