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Pyrene-Derived Iron Complexes for Efficient Photocatalytic CO₂ Reduction.

Haoxiang Wang^1,2, Jianling Zhang^1,2, Yingzhe Zhao^1,2

¹Beijing National Laboratory for Molecular Sciences, CAS Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Center for Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

|May 28, 2025

Summary

Researchers developed novel pyrene-derived iron complexes for efficient photocatalytic carbon dioxide (CO2) reduction to carbon monoxide (CO). These complexes act as photocatalysts, eliminating the need for additional photosensitizers under visible light.

Keywords:

CO2 reductions photocatalysis pyrenes π–π stacking

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Area of Science:

Materials Science
Catalysis
Green Chemistry

Background:

Photocatalytic reduction of carbon dioxide (CO2) offers an environmentally friendly route for CO2 fixation.
Developing efficient photocatalysts that integrate photosensitizing capabilities is crucial to avoid external photosensitizers.

Purpose of the Study:

To synthesize and characterize novel pyrene-derived iron complexes for photocatalytic CO2 reduction.
To investigate the potential of these complexes to act as self-photosensitizing photocatalysts for CO2 conversion to CO.

Main Methods:

Synthesis of two pyrene-derived iron complexes.
Characterization using X-ray single-crystal structures and variable-temperature 1H NMR spectroscopy.
Evaluation of photocatalytic activity for CO2 reduction under visible light, supported by theoretical calculations.

Main Results:

The synthesized complexes exhibit favorable visible-light absorption, fluorescence, and photoelectric properties.
Efficient reduction of CO2 to CO was achieved using the iron complexes as photocatalysts without an additional photosensitizer.
Structure-activity relationships were elucidated through experimental and computational studies.

Conclusions:

Pyrene-derived iron complexes are effective self-photosensitizing photocatalysts for CO2 reduction to CO.
The study provides insights into designing efficient photocatalysts for sustainable CO2 utilization.