Effect of Solvent Assisted Linker Exchange (SALE) and De Novo Synthetic Routes on CO2 Uptake and Fixation by Mixed-Linker Zeolitic Imidazolate Frameworks

Abstract Direct mixing (de novo) and Solvent Assisted Ligand Exchange (SALE) are the main methods used for synthesis of Mixed-Linker Zeolitic Imidazolate Frameworks (ML-ZIFs). ML-ZIFs with combined –NO 2 –Br/–Cl functionalities were prepared via both synthetic routes. Thereafter CO uptake compared, as well their abilities to fixate epoxide substrates. The de novo resulted in SOD topologies, 60: 40 (–NO : –Br/–Cl) functionality ratios, higher porosities, better thermal stability than equivalent SALE products. smaller ML-ZIF crystallites, only ~ 10% incorporation functionalized imidazolate linkers, phase change during activation. ML-ZIF-7 Cl , obtained from direct mixing, highest (90 cm 3 g −1 ), line its porosity. combination tetrabutylammonium bromide (TBAB), showed a high catalytic activity (TOF 446 h ) fixation propylene oxide was reusable up 4 cycles without loss activity. Graphical