Reduction of carbon dioxide by ruthenium complexes containing polypyridyl ligand
- Tamkang Univ., Tamsui (Taiwan, Province of China)
A series of polypyridine dicarbonyl ruthenium complexes, [RuL{sub {ell}}(CO){sub m}X{sub n}] (where L is pyridine or polypyridine = 2,2{prime}-bipyridine, 2,2{prime}:6{prime},2{double_prime}-terpyridine, 1,10-phenanthrolin, 4,4{prime}-dimethyl-2,2{prime}-bipyridine, 2,9-dimethyl-1,10-phenanthrolin, 4,7-dimethyl-1,10-phenanthrolin and X=Cl) have been prepared and characterized by elemental analysis and spectrophotometry complexes. The electrochemistry of these complexes and catalysis of electrochemical reduction of CO{sub 2} by these complexes have been studied by cyclic voltammetry carried out in CH{sub 3}CN solvent. The complexes [Ru(bpy)(CO){sub 2}Cl{sub 2}], [Ru(bpy){sub 2}(CO){sub 2}](PF{sub 6}){sub 2} and [Ru(bpy)(CO){sub 2}Cl](PF{sub 6}) undergo two electron reductive process at - 1.1 V (vs Ag/AgCl). After the reduction potential of -1.1 V a polymeric ruthenium complex film is formed on the surface of the electrode. The complexes, [Ru(CO){sub 2}(terpy)Cl](PF{sub 6}) and [Ru(CO){sub 2}(terpy)(Py)](PF{sub 6}){sub 2} have novel electrochemical characteristics different from the former complexes containing bipyridyl ligand. These complexes catalyzed electrochemical reduction of CO{sub 2} (at about -1.80 V vs. Ag/AgCl) in MeCN - H{sub 2}O mixed solvent containing low concentration of CO{sub 2}. The reaction products were analyzed with gas chromatography and spectrophotometry. By the tuning effect of the ligands on the reductive property of the complex and the mechanism of the CO{sub 2} reduction for these complexes will be proposed.
- OSTI ID:
- 250145
- Report Number(s):
- CONF-9508100--
- Country of Publication:
- United States
- Language:
- English
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