Substantial improvement in the efficiency and durability of a photocatalyst for carbon dioxide reduction using a benzoimidazole derivative as an electron donor

Rhenium(i) trinuclear rings as highly efficient redox photosensitizers for photocatalytic CO2 reduction

“…Because the excited states of the Re-rings with the phenylene chains have stronger oxidation powers compared to the previously reported ring with ethylene chains, which requires the usage of 1,3-dimethyl-2-phenyl-2,3-dihydro-1 H -benzo[ d ]imidazole (BIH) as an electron donor, 39 we could employ triethanolamine (TEOA), which is commonly used in various photocatalytic reactions but is a weaker reductant than BIH. fac -[Re(bpy)(CO) 3 (CH 3 CN)] + ( Re-ACN ) was used as a catalyst; it is quantitatively converted into the CO 2 adduct ( Re-OCO(O)NR 2 ) with the aid of TEOA (eqn (1)) under the photocatalytic reaction conditions.…”

Synthesis, characterization, photophysical and electrochemical properties of fac-tricarbonyl(4,7-dichloro-1,10-phenanthroline)rhenium(I) complexes

“…To meet this energy need, transition metal complexes, especially those with d 6 electron configuration, have been receiving great attention in investigations related to solar energy conversion 1-2 , photocatalysis [3][4][5] , and electroluminescent devices such as LECs [6][7][8] and OLEDs 9-12 , among others. The reasons for the great interest in this class of compound are various and include absorption of radiation in a lower region of the spectrum than observed in organic counterparts; strong spin-orbit coupling, especially for the second and third transition metal, which eliminates the spin-forbidden T 1 →S 0 radiative transition; excited states with intense redox activity allowing the occurrence of a series of electron transfer reactions and/or energy, among others [13][14] .…”

Photocatalytic CO2 Reduction Using Cu(I) Photosensitizers with a Fe(II) Catalyst

“…Note that more than 75% of the added BIH should already be consumed during the irradiation because CO and H 2 are two-electron-reduced products of CO 2 and protons, respectively, and BIH is a two-electron donor. 8 Accordingly, BIH concentration in the reaction solution was increased to 50 mM. After 12 h irradiation, 54.5 µmol of CO (TON CAT CO = 273) and 15.0 µmol of H 2 (TON CAT H2 = 75) were produced; the selectivity of CO formation was 78%.…”