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Photochemical Reduction of Carbon Dioxide to Formic Acid using Ruthenium(II)‐Based Catalysts and Visible Light
Author(s) -
RosasHernández Alonso,
Junge Henrik,
Beller Matthias
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500494
Subject(s) - formic acid , photochemistry , chemistry , catalysis , photocatalysis , ruthenium , photosensitizer , triethanolamine , turnover number , electron transfer , pyridine , inorganic chemistry , medicinal chemistry , organic chemistry , analytical chemistry (journal)
A photocatalytic system that consists of an Ir‐based photosensitizer and a Ru II bipyridine catalyst was developed for the selective reduction of CO 2 to formic acid using triethanolamine as the electron donor. Catalyst turnover numbers up to 526 and a selectivity of 80 % towards formic acid were observed if the photocatalytic reaction was performed with [Ir(ppy) 2 (bpy)]PF 6 (ppy=2‐(pyridine‐2‐yl)benzene‐1‐ide, bpy=2,2′‐bipyridine) as the photosensitizer and [Ru(bpy) 2 (Cl)(CO)]PF 6 as the catalyst under visible‐light irradiation ( λ =400–700 nm). Interestingly, this photocatalytic system showed activity for the photoreduction of Na 2 CO 3 to formic acid as well. The investigation of different ruthenium(II) catalysts revealed the positive influence of carbonyl ligands coordinated to the metal center. The enhancement of the catalytic activity is explained by a more favorable electron transfer from the photosensitizer to the catalyst, which is supported by the redox potentials of the complexes.