Issue 10, 2019

CO2 capture by Mn(i) and Re(i) complexes with a deprotonated triethanolamine ligand

Abstract

CO2 capture at low concentration by catalysts is potentially useful for developing photocatalytic and electrocatalytic CO2 reduction systems. We investigated the CO2-capturing abilities of two complexes, fac-Mn(X2bpy)(CO)3(OCH2CH2NR2) and fac-Re(X2bpy)(CO)3(OCH2CH2NR2) (X2bpy = 4,4′-X2-2,2-bipyridine and R = –CH2CH2OH), which work as efficient catalysts for CO2 reduction. Both complexes could efficiently capture CO2 even from Ar gas containing only low concentration of CO2 such as 1% to be converted into fac-M(X2bpy)(CO)3(OC(O)OCH2CH2NR2) (M = Mn and Re). These CO2-capturing reactions proceeded reversibly and their equilibrium constants were >1000. The substituents of X2bpy strongly affected the CO2-capturing abilities of both Mn and Re complexes. The density functional theory (DFT) calculation could be used to estimate the CO2-capturing abilities of the metal complexes in the presence of triethanolamine.

Graphical abstract: CO2 capture by Mn(i) and Re(i) complexes with a deprotonated triethanolamine ligand

Supplementary files

Article information

Article type
Edge Article
Submitted
03 okt 2018
Accepted
16 jan 2019
First published
17 jan 2019
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2019,10, 3080-3088

CO2 capture by Mn(I) and Re(I) complexes with a deprotonated triethanolamine ligand

H. Koizumi, H. Chiba, A. Sugihara, M. Iwamura, K. Nozaki and O. Ishitani, Chem. Sci., 2019, 10, 3080 DOI: 10.1039/C8SC04389B

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