Temperature-tuned topologies and interpenetrations of two 3D porous copper(II)-organic frameworks and gas adsorption behaviors

In summary, two three-dimensional Cu(II)-organic frameworks [Cu(PC)2]n·2DMF (1) and [Cu(PC)2]n·DMF (2) were obtained via tuning the solvothermal temperatures of the system of HPC and Cu(NO3)2. Compound 1 exhibited a rare fivefold interpenetrating lvt framework with BET surface area of 776 cm3/g and compound 2 shown a sevenfold interpenetrating dia framework with BET surface area of 464 cm3/g. [Display omitted] •Two Cu-organic frameworks with rare five-fold interpenetrating lvt framework and seven-fold interpenetrating dia framework were synthesized via tuning the reaction temperatures.•Two Cu(II)-organic frameworks exhibited different pore sizes and shapes.•The gas adsorption behaviors of two Cu(II)-organic frameworks was investigated. In this article, two novel three-dimensional (3D) Copper(II)-organic frameworks [Cu(PC)2]n·2DMF(1) and [Cu(PC)2]n·DMF (2) (HPC = 4-(2-(pyridin-4-yl)vinyl)benzoic acid) were obtained from the same reaction mixture but tuned by different solvothermal temperature, The product 1, which was obtained at 160 °C, is a rare fivefold interpenetrating lvt framework, whereas the product 2, obtained at 120 °C, exhibits a sevenfold interpenetrating dia framework. Their structures have been characterized by single crystal X-ray diffraction, infrared spectroscopy (IR), powder X-ray diffraction (PXRD), elemental analysis and thermogravimetric analysis (TGA). The N2 adsorption isotherm revealed that the BET surface areas of 1 and 2 were 780 and 464 m2/g, respectively. Regrettably, no adsorption of CO2, CH4 or N2 was observed at 273 K.