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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.

SUBMITTER: Koizumi H 

PROVIDER: S-EPMC6429607 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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CO<sub>2</sub> capture by Mn(i) and Re(i) complexes with a deprotonated triethanolamine ligand.

Koizumi Hiroki H   Chiba Hiroyuki H   Sugihara Ayumi A   Iwamura Munetaka M   Nozaki Koichi K   Ishitani Osamu O  

Chemical science 20190117 10

CO<sub>2</sub> capture at low concentration by catalysts is potentially useful for developing photocatalytic and electrocatalytic CO<sub>2</sub> reduction systems. We investigated the CO<sub>2</sub>-capturing abilities of two complexes, <i>fac</i>-Mn(X<sub>2</sub>bpy)(CO)<sub>3</sub>(OCH<sub>2</sub>CH<sub>2</sub>NR<sub>2</sub>) and <i>fac</i>-Re(X<sub>2</sub>bpy)(CO)<sub>3</sub>(OCH<sub>2</sub>CH<sub>2</sub>NR<sub>2</sub>) (X<sub>2</sub>bpy = 4,4'-X<sub>2</sub>-2,2-bipyridine and R = -CH<sub>2</  ...[more]

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