Related Experiment Video
Updated: Dec 20, 2025
06:31
Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
Published on: March 19, 2020
7.5K
Old Dog, New Tricks: Innocent, Five-coordinate Cyanocobalt Corroles
W Ryan Osterloh1, Nicolas Desbois2, Valentin Quesneau2
1Department of Chemistry, University of Houston, Houston 77204-5003, Texas, United States.
Inorganic Chemistry
|May 27, 2020
Summary
New anionic cobalt corroles with cyanide ligands are air-stable and show unique redox properties. These findings advance understanding of metallocorrole chemistry and high-valent metal stabilization.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Cobalt corroles are versatile macrocyclic complexes with diverse applications.
- Anionic axial ligands can significantly influence the electronic and redox properties of metal complexes.
- Previous cobalt corroles often lacked stability with anionic axial ligands.
Purpose of the Study:
- To synthesize and characterize novel anionic cobalt corroles with mono-cyanide axial ligands.
- To investigate the spectroscopic and electrochemical properties of these new complexes.
- To explore the influence of anionic axial ligands on the stability and redox behavior of cobalt corroles.
Main Methods:
- Synthesis of three A3-triarylcorrole derivatives with anionic mono-cyanide ligands.
- Spectroscopic analysis (UV-Vis) and electrochemical studies (redox potentials) in various solvents (CH2Cl2, Pyridine, DMSO).
- Determination of formation constants for bis-cyanide adducts using spectroscopic methods.
Main Results:
- First examples of air-stable cobalt corroles featuring an anionic axial ligand.
- Demonstrated facile first oxidation and difficult first reduction compared to previously studied corroles.
- High stability of bis-cyanide adducts in non-aqueous solvents, contrasting with N-donor ligand complexes.
- Established linear free energy relationships between substituent constants and physicochemical properties.
Conclusions:
- The cyanide axial ligand effectively stabilizes high-valent cobalt species in metallocorroles.
- These anionic cobalt corroles exhibit predictable physicochemical trends based on meso-phenyl substituents.
- The study provides a new class of stable metallocorroles with tunable electronic properties.
More Related Videos
09:00An In Vitro Enzymatic Assay to Measure Transcription Inhibition by GalliumIII and H3 5,10,15-trispentafluorophenylcorroles
Published on: March 18, 2015
12.0K
10:21Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.8K
Related Concept Videos
03:02Colors and Magnetism
13.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.6K
02:42Valence Bond Theory
10.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
10.8K
02:45Valence Bond Theory
48.8K
Overview of Valence Bond Theory
48.8K
02:34Structural Isomerism
21.3K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.3K
01:23Properties of Organometallic Compounds
1.5K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.5K
02:58Properties of Transition Metals
29.0K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.0K