Abstract
A rhenium(I) tricarbonyl diimine complex with a N,N-dimethylformamide ligand captures one CO2 molecule in the presence of triethanolamine (TEOA), giving fac-[Re(I)(bpy)(CO)3{R2N-CH2CH2O-COO}] (bpy = 2,2'-bipyridine, R = CH2CH2OH). This could be a predominant complex in various photocatalytic CO2 reduction reactions using [Re(I)(N^N)(CO)3X](n+) (N^N = diimine ligand; X = monodentate ligand; n = 0, 1) type complexes in the presence of TEOA.
Highlights
According to reported reaction conditions, TEOA is known as a “magic” sacrificial electron donor, which can enhance the turnover number and the selectivity of CO formation, compared with other reductants such as triethylamine.[20]
The results showed that a CO2 molecule is captured by the [ReI(N^N)(CO)3]+ species with the assistance of TEOA even when the Re complex is not reduced
Addition of TEOA to the solution (DMF/TEOA = 5:1 v/v) gave a 1:2 thermodynamically equilibrated mixture of 3 and fac-[ReI(bpy)(CO)3(OCH2CH2NR2)] (4, R = CH2CH2OH), which could be characterized by the large shift to lower wavenumbers (2006, 1897, and 1881 cm−1) in IR spectra (Figure 1b).[21]
Summary
According to reported reaction conditions, TEOA is known as a “magic” sacrificial electron donor, which can enhance the turnover number and the selectivity of CO formation, compared with other reductants such as triethylamine.[20]. The results showed that a CO2 molecule is captured by the [ReI(N^N)(CO)3]+ species with the assistance of TEOA even when the Re complex is not reduced.
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