Related Experiment Video
Updated: May 28, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Carbon dioxide reduction by mononuclear ruthenium polypyridyl complexes
Nora Planas1, Takashi Ono, Lydia Vaquer
1Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain.
Physical Chemistry Chemical Physics : PCCP
|October 6, 2011
Summary
New ruthenium complexes efficiently catalyze the hydrogenative reduction of carbon dioxide (CO2) to formic acid. Quantum chemical calculations revealed catalytic mechanisms and the influence of substituent groups on performance.
Area of Science:
- Inorganic Chemistry
- Catalysis
- Organometallic Chemistry
Background:
- Carbon dioxide (CO2) reduction is crucial for sustainable energy and mitigating greenhouse gas emissions.
- Ruthenium complexes are promising catalysts for CO2 conversion due to their versatile coordination chemistry.
Purpose of the Study:
- To synthesize and evaluate novel mononuclear ruthenium complexes as precatalysts for CO2 hydrogenative reduction.
- To investigate the catalytic mechanisms and the impact of ligand substituents on catalyst efficiency using experimental and theoretical methods.
Main Methods:
- Synthesis of mononuclear ruthenium complexes with general formula [Ru(bid)(B)(Cl)].
- Catalytic testing for CO2 reduction in 2,2,2-trifluoroethanol (TFE) with triethylamine (NEt3).
- Kinetic analysis and quantum chemical calculations to elucidate reaction mechanisms and intermediate species.
Main Results:
- The synthesized ruthenium complexes effectively produced significant amounts of formic acid from CO2.
- Kinetic studies provided insights into the reaction rates and catalytic pathways.
- Quantum chemical calculations helped understand the role of electron-donating and electron-withdrawing groups in influencing catalyst performance.
Conclusions:
- The novel ruthenium complexes are efficient precatalysts for the hydrogenative reduction of CO2 to formic acid.
- Understanding the mechanistic pathways and substituent effects is key to designing improved catalysts for CO2 utilization.
More Related Videos
Related Concept Videos
02:13Reduction of Alkenes: Catalytic Hydrogenation
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:23Alcohols from Carbonyl Compounds: Reduction
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
01:28Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
01:18Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...