Ligand‐Assisted Electrochemical CO2 Reduction by Ru‐Polypyridyl Complexes

The introduction of a simple triazole moiety on a terpyridine ligand in the complex [Ru(tpy)(bpy)(Cl)]+ ([1]+; tpy = 2,2':6',2''‐terpyridine; bpy = 2,2'‐bipyridine) gives rise to a suitable electrocatalyst for the reduction of CO2 to CO. The triazole group in [Ru(tpyaz)(bpy)...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2020-05, Vol.2020 (18), p.1814-1818
Main Authors: Ghosh, Debashis, Kajiwara, Takashi, Kitagawa, Susumu, Tanaka, Koji
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide reduction
Chemical reduction
Coordination compounds
Electrochemistry
Electrons
Homogeneous
Inorganic chemistry
Ligands
Polypyridyl ligand
Ruthenium
Triazoles
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Summary:The introduction of a simple triazole moiety on a terpyridine ligand in the complex [Ru(tpy)(bpy)(Cl)]+ ([1]+; tpy = 2,2':6',2''‐terpyridine; bpy = 2,2'‐bipyridine) gives rise to a suitable electrocatalyst for the reduction of CO2 to CO. The triazole group in [Ru(tpyaz)(bpy)(Cl)]+ {[2]+; tpyaz = 4'‐[4‐(tert‐butylphenyl)‐1H‐1,2,3‐triazol‐4‐yl]‐2,2':6',2''‐terpyridine} enables the complex [2]+ to bind with CO2 even at the one‐electron reduced state of the complex. Further 2nd‐electron addition after CO2‐coordination to the catalyst facilitates efficient CO2 reduction, based on cyclic voltammetry analysis. By incorporating a triazole moiety in the ligand framework in newly synthesized Ru‐polypyridyl complexes, efficient electrocatalytic reduction of CO2 to CO was achieved in mixed CH3CN/H2O (95/5) solvent.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202000259