Synthesis, crystal structure and adsorption properties of a novel Mn(II) coordination polymer

A novel Mn(II) coordination polymer based on a “V”-shaped 1,3-di(4′-carboxyl-phenyl)benzene acid (H2dpb, dpb = 1,3-di(4′-carboxyl-phenyl)benzene), namely {[Mn(dpb)(4,4′-bibp)]·H2O}n (4,4′-bibp = 4,4′-bis(imidazol-1-yl)biphenyl) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction and further characterized by elemental analysis, IR spectra, and thermogravimetric analysis (TGA). Furthermore, CO2 and SO2 adsorption properties of the complex were tested by high-pressure adsorption instrument under different pressure. The results show that the adsorption performance of CO2 is far superior to SO2 on the same conditions. The adsorption capacity increases with temperature rising. Very interestingly, the saturated adsorption amount (5.5 mmol/g) at 100 °C is less than the one at 80 °C (7.20 mmol/g). This phenomenon is caused by the escape of water vapor.