A mesoporous aluminium metal–organic framework with 3 nm open pores

Abstract

A mesoporous metal–organic framework of [Al(OH)(SDC)] (CYCU-3) (H₂SDC = 4,4′-stilbenedicarboxylic acid) was synthesised by using Al(III) ions and H₂SDC under solvothermal conditions. The structure forms 3D mesoporous frameworks in which the carboxylate oxygen on each terminus of the ligand forms octahedral AlO₆ by corner-sharing. As verified by N₂ sorption measurements, the CYCU-3 exhibits the largest pore volume and open channels (3.0 nm) in the system of Al-MOFs reported to date. This mesoporous Al-MOF also displays highly porous properties and uptake capacities of H₂ (8.22 mmol g⁻¹ at 77 K and 1 atm) and CO₂ (2.83 mmol g⁻¹ CO₂ at 273 K and 1 atm).