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

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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

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Publication details

The article was received on 03 Oct 2018, accepted on 16 Jan 2019 and first published on 17 Jan 2019


Article type: Edge Article
DOI: 10.1039/C8SC04389B
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    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, Advance Article , DOI: 10.1039/C8SC04389B

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