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

• Two different coordination polymers have been prepared.
• Compound 2 exhibits an unprecedented supramolecular framework.
• The carboxylic group in the 2-position of 1,2,4-H3BTC affect the structure of 2.
• Two complexes exhibit good thermal stabilities and photoluminescence properties.

Two coordination polymers, formulated as {[Cd(1,4-BDC)(ppene)]·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)2·4H2O 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 41263-pcu network. The coordination network of 2 shows a three-dimensional (4,5)-connected framework with rare (4462)(4466) 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 Schläfli symbol (4862)(4664). Thermal stability and photoluminescence properties of 1 and 2 were also investigated.

Graphic abstractTwo different coordination networks {[Cd(1,4-BDC)(ppene)]·CH3CN}n (1) and [Cd(H2O)(1,2,4-HBTC)(ppene)0.5]n (2) have been prepared by the assemblies of Cd(NO3)2, ppene and 1,4-H2BDC or 1,2,4-H3BTC, respectively. Their thermal and photoluminescence properties were also investigated.Figure optionsDownload as PowerPoint slide