Novel Light-Responsive Metal-Organic Framework with Perchlorinated Nanographene Ligands

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Harnessing water as a sustainable electron source for artificial photosynthesis remains a significant challenge. This work presents Alice-MOF-1, a novel zirconium metal-organic framework incorporating hexatopic ligands with perchlorinated hexa-peri-hexabenzocoronene (HBC) cores, as a photocatalyst for CO2 reduction using water as the terminal electron donor. Contortion of the ligand, induced by edge chlorination, minimizes π-stacking and enhances solubility, enabling direct MOF synthesis. The controlled arrangement of chromophores within Alice-MOF-1, facilitated by the ligand, is crucial for enabling the complex multi-electron redox reactions. The unique ligand architecture within the MOF promotes symmetry-breaking charge transfer (SBCT), a mechanism observed in natural photosynthesis, leading to efficient charge separation with minimal energy loss. Femtosecond transient absorption spectroscopy and time-resolved electron paramagnetic resonance spectroscopy confirm the formation of long-lived radical ions, providing direct evidence for efficient SBCT and minimal charge recombination. These findings demonstrate the power of MOF-based chromophore assemblies to mimic nature's light-harvesting strategies for sustainable energy conversion.

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