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Methods
A general method for photocatalytic CO2RR (entry 1 in Supplementary Table 4 as a
representative example) was followed: A flame-dried 50-mL Schlenk tube with a Teflon
cap and a magnetic stir bar was charged with BI+(I-) (7.2 mg, 0.025 mmol, 2.5 mM),
PS 1 (3.8 mg, 0.015 mmol, 1.5 mM), ascorbic acid (88.1 mg, 0.500 mmol, 50 mM), and
K2CO3 (76.0 mg, 0.550 mmol, 55 mM). CH3CN (8 mL) and distilled water (2 mL) were
then introduced into the mixture, and the reaction mixture was degassed by three
freeze–pump–thaw cycles. Subsequently, the reaction mixture was backfilled with CO2
(>99.995% purity), and the CO2 atmosphere was maintained using a balloon. The
reaction mixture was stirred under visible-light irradiation (λmax = 400 nm) for 4 h. After
the reaction, 1,3,5-trimethyoxybenzene (40.6 mg) as an internal standard and distilled
water (4 mL) were added to the resulting reaction mixture. Finally, 0.6 mL of the
solution was transferred to an NMR tube and subjected to 1H NMR spectroscopic
analysis using the solvent suppression technique. The yield of formate was 72 mM.
Data Availability
The additional discussions and the data supporting the plots within this paper and other
findings of this study, such as 1H NMR and 13C NMR spectra, cyclic voltammograms,
optical spectra, experimental procedures, and quantum chemical calculations, are
available in the Supplementary Information.
Information of the corresponding authors
Masahiro Yamanaka
15
myamanak@rikkyo.ac.jp
Yasuhiro Kobori
ykobori@kitty.kobe-u.ac.jp
Ryosuke Matsubara
matsubara.ryouske@people.kobe-u.ac.jp
16
...
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