Iodide-Photocatalyzed Reduction of Carbon Dioxide to Formic Acid with Thiols and Hydrogen Sulfide

The photolysis of iodide anions promotes the reaction of carbon dioxide with hydrogen sulfide or thiols to quantitatively yield formic acid and sulfur or disulfides. The reaction proceeds in acetonitrile and aqueous solutions, at atmospheric pressure and room temperature by irradiation using a low‐p...

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Bibliographic Details
Published in:ChemSusChem 2016-12, Vol.9 (24), p.3397-3400
Main Authors: Berton, Mateo, Mello, Rossella, González-Núñez, María Elena
Format: Article
Language:English
Subjects:
Acetonitrile
Anions
Aqueous solutions
Atmospheric pressure
Carbon dioxide
Carbon Dioxide - chemistry
carbon dioxide fixation
Catalysis
Formates - chemistry
Formic acid
Hydrogen sulfide
Hydrogen Sulfide - chemistry
Iodides - chemistry
Oxidation-Reduction
photocatalysis
Photochemical Processes
potassium iodide
Reduction
Sulfhydryl Compounds - chemistry
Thiols
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Summary:The photolysis of iodide anions promotes the reaction of carbon dioxide with hydrogen sulfide or thiols to quantitatively yield formic acid and sulfur or disulfides. The reaction proceeds in acetonitrile and aqueous solutions, at atmospheric pressure and room temperature by irradiation using a low‐pressure mercury lamp. This transition‐metal‐free photocatalytic process for CO2 capture coupled with H2S removal may have been relevant as a prebiotic carbon dioxide fixation. Connecting the dots: The electron photodetachment from iodide anions, the hydrogen transfer from thiols to carbon dioxide radical anions, and the oxidation of thiols by iodine define a robust and transition‐metal‐free photocatalytic method for the reduction of carbon dioxide to formic acid by using thiols and hydrogen sulfide at atmospheric pressure in aqueous and acetonitrile solution.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201601285