Donor-Flexible Nitrogen Ligands for Efficient Iridium-Catalyzed Water Oxidation Catalysis
Miquel Navarro1,2, Mo Li3, Helge Müller-Bunz2
1Department of Chemistry & Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 27, 2016
Summary
A novel pyridylideneamide ligand enhances iridium-catalyzed water oxidation for solar fuel production. This dynamic ligand boosts catalytic activity and stability, crucial for efficient solar fuel devices.
Area of Science:
- Inorganic Chemistry
- Catalysis
- Solar Energy Conversion
Background:
- Water oxidation is essential for solar fuel production.
- Developing efficient and stable catalysts is a key challenge.
- Iridium complexes are promising for water oxidation catalysis.
Purpose of the Study:
- To design and utilize a dynamic pyridylideneamide ligand for iridium-catalyzed water oxidation.
- To improve the activity and stability of water oxidation catalysts.
- To advance the development of efficient solar fuel devices.
Main Methods:
- Synthesis of a pyridylideneamide ligand with tunable donor properties.
- Coordination of the ligand to a Cp* iridium center.
- Electrochemical and spectroscopic characterization of the catalytic system.
- Evaluation of catalytic performance in water oxidation.
Main Results:
- The dynamic ligand exhibits both zwitterionic and diene-type resonance structures.
- The iridium complex demonstrated a nearly three-fold increase in turnover frequency compared to benchmarks.
- Exceptionally high turnover numbers were achieved, indicating catalyst robustness.
- The catalytic cycle showed minimal degradation, highlighting ligand stability.
Conclusions:
- The pyridylideneamide ligand significantly enhances iridium-based water oxidation catalysis.
- The ligand's dynamic nature contributes to high activity and stability.
- This work represents a significant step towards efficient solar fuel generation.
More Related Videos
10:39Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
8.4K
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
3.5K
Related Concept Videos
02:51Metal-Ligand Bonds
25.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
25.4K
01:19Complexation Equilibria: The Chelate Effect
1.5K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.5K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.0K
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...
4.0K
00:43Complexometric Titration: Ligands
2.6K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.6K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.4K
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.
9.4K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
13.4K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
13.4K