biostudies-literatureUnknown7(28)Pappuru SThe conversion of CO₂ and epoxides to cyclic carbonates over a silica-supported di-iron(III) complex having a reduced Robson macrocycle ligand system is shown to proceed at 1 atm and 80 °C, exclusively producing the <i>cis</i>-cyclohexene carbonate from cyclohexene oxide. We examine the effect of immobilization configuration to show that the complex grafted in a semirigid configuration catalytically outperforms the rigid, flexible configurations and even the homogeneous counterparts. Using the semirigid catalyst, we are able to obtain a TON of up to 800 and a TOF of up to 37 h^-1 under 1 atm CO₂. The catalyst is shown to be recyclable with only minor leaching and no change to product selectivity. We further examine a range of epoxides with varying electron-wACS omega24656-24661https://www.ebi.ac.uk/biostudies/studies/S-EPMC9301958biostudies-literatureAtmospheric-Pressure Conversion of CO₂ to Cyclic Carbonates over Constrained Dinuclear Iron Catalysts.PMC9301958Carmieli RPappuru SShpasser DJentoft FCShekhter PGazit OMfalseAtmospheric-Pressure Conversion of CO₂ to Cyclic Carbonates over Constrained Dinuclear Iron Catalysts.The conversion of CO₂ and epoxides to cyclic carbonates over a silica-supported di-iron(III) complex having a reduced Robson macrocycle ligand system is shown to proceed at 1 atm and 80 °C, exclusively producing the <i>cis</i>-cyclohexene carbonate from cyclohexene oxide. We examine the effect of immobilization configuration to show that the complex grafted in a semirigid configuration catalytically outperforms the rigid, flexible configurations and even the homogeneous counterparts. Using the semirigid catalyst, we are able to obtain a TON of up to 800 and a TOF of up to 37 h^-1 under 1 atm CO₂. The catalyst is shown to be recyclable with only minor leaching and no change to product selectivity. We further examine a range of epoxides with varying electron-w2022-01-01T00:00:00Z2022 Jul2025-04-25T18:15:40.579Z2025-04-06T07:30:49.715ZS-EPMC93019583587420610.1021/acsomega.2c02488