Journal
CHEMPHOTOCHEM
Volume 2, Issue 3, Pages 207-212Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cptc.201700133
Keywords
carbon dioxide reduction; homogeneous catalysis; iridium; photocatalysis; visible light
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Funding
- Precursory Research for Embryonic Science and Technology (PRESTO)
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Mononuclear iridium(III) terpyridine (tpy) 2,2-bipyridine (bpy) [Ir(tpy)(bpy)Cl](2+) photocatalysts (denoted [Ir(bpy)]) were developed for selective CO2 reduction to HCOOH under visible light. The CO2 reduction product could be changed dramatically by substituting a 2-phenylpyridine (ppy) ligand with bpy, with the mononuclear Ir ppy complex ([Ir(tpy)(ppy)Cl](+)) acting as a photocatalyst for selective CO2 reduction to CO. A mechanistic study showed a structural change in [Ir(bpy)] during the photocatalytic reaction. The [Ir(bpy)] complex was transformed into an iridium-hydride complex ([Ir(tpy)(bpy)H](2+)) during an early stage of the photocatalytic reaction. However, [Ir(tpy)(bpy)H](2+) did not function as a key intermediate in the photochemical CO2 reduction because an additional structural change occurred. The tpy ligand of the Ir complex was reduced to piperidine-2,6-di-2-pyridine ligand during the photocatalytic reaction, resulting in the production of [Ir(piperidine-2,6-di-2-pyridine)(bpy)H](2+), which was the actual photocatalyst for HCOOH production.
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