N-alkyl substitution–from methyl to heptyl–in isoreticular MIL-125-NH2 MOFs induces a stepwise decrease in the optical bandgap, while increasing CO2 photoreduction efficiencies.

We demonstrate that the highly photoredox active metal-organic framework (MOF) MIL-125-NHCyp exhibits crystalline and porosity stability in humid environments for more than 30 days as well as increased hydrophobicity compared to the unfunctionalized framework. This improved stability, in synergy with its high photocatalytic activity, makes this MOF a very promising candidate for large-scale applications in CO photoreduction.

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