Journal
JACS AU
Volume 3, Issue 7, Pages 1984-1997Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacsau.3c00218
Keywords
noble-metal-free system; CO2 photoreduction; transient; X-ray; absorption spectroscopy; electron transfer; coordinative; interaction
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By exploiting intermolecular interactions to facilitate electron delivery, two Cu(I) photosensitizers with different pyridyl pendants were designed to interact with cobalt macrocyclic catalyst, significantly enhancing the photocatalytic efficiency of a fully noble-metal-free system for CO2 reduction.
Improving the photocatalytic efficiency of a fully noble-metal-freesystem for CO2 reduction remains a fundamental challenge,which can be accomplished by facilitating electron delivery as a consequenceof exploiting intermolecular interactions. Herein, we have designedtwo Cu(I) photosensitizers with different pyridyl pendants at thephenanthroline moiety to enable dynamic coordinative interactionsbetween the sensitizers and a cobalt macrocyclic catalyst. Comparedto the parent Cu(I) photosensitizer, one of the pyridine-tetheredderivatives boosts the apparent quantum yield up to 76 & PLUSMN; 6% at425 nm for selective (near 99%) CO2-to-CO conversion. Thisvalue is nearly twice that of the parent system with no pyridyl pendants(40 & PLUSMN; 5%) and substantially surpasses the record (57%) of thenoble-metal-free systems reported so far. This system also realizesa maximum turnover number of 11 800 & PLUSMN; 1400. In contrast,another Cu(I) photosensitizer, in which the pyridine substituentsare directly linked to the phenanthroline moiety, is inactive. Theabove behavior and photocatalytic mechanism are systematically elucidatedby transient fluorescence, transient absorption, transient X-ray absorptionspectroscopies, and quantum chemical calculations. This work highlightsthe advantage of constructing coordinative interactions to fine-tunethe electron transfer processes within noble-metal-free systems forCO(2) photoreduction.
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