Related Experiment Video
Updated: May 25, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Asymmetrical diruthenium complex bridged by a redox-active ligand
Amit Das1, Thomas Michael Scherer, Abhishek Dutta Chowdhury
1Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
Inorganic Chemistry
|January 19, 2012
Summary
This study synthesized an asymmetrical dinuclear ruthenium complex, [(acac)(2)Ru1(μ-abpy)Ru2(Cym)Cl]PF(6), revealing its unique electronic structure and redox behavior. The complex exhibits interesting magnetic coupling and undergoes reversible oxidation and reduction, providing insights into mixed-valent ruthenium systems.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
- Materials Science
Background:
- Dinuclear ruthenium complexes with bridging ligands are of interest for their unique electronic and magnetic properties.
- Understanding the interplay between metal centers and bridging ligands is crucial for designing novel functional materials.
Purpose of the Study:
- To synthesize and characterize a novel asymmetrical dinuclear ruthenium complex, [(acac)(2)Ru1(μ-abpy)Ru2(Cym)Cl]PF(6).
- To investigate the electronic structure, oxidation states, and magnetic properties of the complex and its redox derivatives.
- To explore the electrochemical behavior and ligand-based redox activity of the dinuclear system.
Main Methods:
- Synthesis of mononuclear ruthenium precursors and the target dinuclear complex.
- X-ray crystal structure analysis to determine molecular geometry and bonding.
- Spectroelectrochemistry and Electron Paramagnetic Resonance (EPR) spectroscopy to study redox states and electronic properties.
- Density Functional Theory (DFT) calculations for electronic structure analysis and transition assignments.
Main Results:
- The asymmetrical dinuclear complex [(acac)(2)Ru1(μ-abpy)Ru2(Cym)Cl]PF(6) was successfully synthesized and characterized.
- X-ray analysis indicated a mixed-valent Ru(III)/Ru(II) configuration with antiferromagnetic coupling through a radical anion bridging ligand (abpy•-).
- Reversible one-electron oxidation to a dication and complex, partially irreversible reduction pathways involving ligand and metal-centered changes were observed and analyzed.
Conclusions:
- The study provides a detailed characterization of a novel asymmetrical dinuclear ruthenium complex, highlighting its mixed-valent nature and radical bridging ligand.
- The electrochemical and spectroscopic data, supported by DFT calculations, elucidate the electronic structure and redox behavior of the complex and its derivatives.
- This work contributes to the understanding of electron transfer and magnetic interactions in polynuclear metal complexes.
More Related Videos
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
Related Concept Videos
02:51Metal-Ligand Bonds
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...
02:34Structural Isomerism
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 be...
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 be...
01:22EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
01:19Complexation Equilibria: The Chelate Effect
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...
02:42Valence Bond Theory
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...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.