Exploiting consecutive photoinduced electron transfer (ConPET) in CO₂ photoreduction

Abstract

The consecutive photoinduced electron transfer (ConPET) process of 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) in CO2 photoreduction to achieve powerful reducing species has been disclosed by activating a bis(terpyridine)ruthenium(II) complex bearing a high overpotential...

Morphology Control of Supramolecular Assembly for Superior CO2Photoreduction

“…The new absorption band was ascribed to the ligand-based radical anion of terpyridine (tpy •– ) in G1 , resulting from the electron transfer process from 4CzIPN to terpyridine units. It has been reported that terpyridine-based radical anions exhibit an absorption band around 600 nm, which can further interact with CO 2 . ,− As shown in Figure f, this absorption band at 605 nm went down slowly in the dark under a N 2 atmosphere. However, it can disappear in 2 min under a CO 2 atmosphere, suggesting the ligand-based electron transfer between G1 and CO 2 (Figure S18).…”

“…Therefore, the electron transfer from 4CzIPN* to assemblies A1 , A2 , and G1 is feasible due to the fact that the CB potentials of the three assemblies are more positive (>−0.94 V) (Figure d), which is also verified by the PL quenching experiments (Figure d). However, 4CzIPN* can also be reductively quenched by the sacrificial electron donor TEA to generate the reduced state of 4CzIPN (4CzIPN •– ) . Then, the electron transfer from the species 4CzIPN •– ( E red = −1.0 vs NHE) to assemblies A1 , A2 , and G1 is also feasible.…”

“…However, 4CzIPN* can also be reductively quenched by the sacrificial electron donor TEA to generate the reduced state of 4CzIPN (4CzIPN •− ). 50 Then, the electron transfer from the species 4CzIPN •− (E red = −1.0 vs NHE) to assemblies A1, A2, and G1 is also feasible. That is to say, the electron transfer from 4CzIPN to the three assemblies are indeed feasible through either reductive quenching or oxidative quenching of 4CzIPN* upon light irradiation.…”

A Small Organic Molecular Catalyst with Efficient Electron Accumulation for Near‐unity CO2 Photoreduction

“…It is noteworthy that Ir(ppy) 3 in the photoexcited sate is a modest reductant with a reduction potential about −1.70 V vs. SCE which is strong enough for promoting the reduction of Bptpy + to Bptpy 0 (−0.96 V). However, 4CzIPN is reported to generate a highly reducing species upon light irradiation that could even reduce 1,4‐dichlorobenzene with a potential about −2.24 V [48] . Therefore, 4CzIPN used here is powerful enough to reduce Bptpy + to Bptpy − as shown in Figure 4f at the step (4).…”

“…To evaluate the photocatalytic performance of Bptpy + as a molecular photocatalyst in CO 2 RR, the organic photosensitizer 4CzIPN was used as the photosensitizer because it was found to be a powerful photosensitizer in our previous studies. [16,[46][47][48] As can be seen from Figure 3, photocatalytic reactions have been performed under various conditions. Figure 3a shows the yield of CO is related to the volume of water in the reaction solution.…”