Synthesis and characterization of [Cu(SiF₆)(4,4′-bpy)₂] with its H₂ and CO₂ adsorption

Abstract

A 3-D porous metal-organic framework [Cu(SiF 6 )(4,4 0 -bpy) 2 ] was reported to have high methane storage. The studies about [Cu(SiF 6 )(4,4 0 -bpy) 2 ] were only related with methane storage but information on detailed synthesis and characterization as well as adsorption properties of [Cu(SiF 6 )(4,4 0 -bpy) 2 ], especially the H 2 and CO 2 adsorption properties, was scarce. In this work, [Cu(SiF 6 )(4,4 0 -bpy) 2 ] has been synthesized by adjusting the molar ratio of the reagents, synthesis temperature, and crystallization time. This method for obtaining [Cu(SiF 6 )(4,4 0 -bpy) 2 ] at low temperature has not been reported before. Temperature played an important role in synthesis of the sample and low temperature was beneficial for synthesizing bigger sample. Adsorption isotherms for carbon dioxide and hydrogen were measured under high pressure. [Cu(SiF 6 )(4,4 0 -bpy) 2 ] exhibited H 2 storage up to 2.36 wt% at 18 bar and a high CO 2 capture up to 4.17 mmol g À1 at 298 K at 10 bar.