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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Structural Isomerism02:34

Structural Isomerism

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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...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

518
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...
518
Stereoisomerism02:52

Stereoisomerism

11.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.9K
Colors and Magnetism03:02

Colors and Magnetism

11.7K
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...
11.7K
Valence Bond Theory02:42

Valence Bond Theory

8.6K
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...
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Updated: Jul 7, 2025

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

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Coligands Controlled Reactivities of Ruthenium(II) Precursors: Antiferromagnetically Coupled Ruthenium(III)-Phenoxyl

Debasish Samanta1, Pinaki Saha1, Suvendu Maity1

  • 1Department of Chemistry, Ramakrishna Mission Residential College, Narendrapur, Kolkata 700103, India.

Inorganic Chemistry
|December 23, 2023
PubMed
Summary

Ruthenium complexes exhibit distinct reactivities based on their ligands. One precursor promotes methoxy demethylation, while another facilitates C-H activation, leading to diverse bond formations and unique ruthenium-centered reactions.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor
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Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor
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Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Catalysis

Background:

  • Ruthenium complexes are versatile catalysts in organic synthesis.
  • Understanding ligand effects on ruthenium reactivity is crucial for designing new transformations.

Purpose of the Study:

  • To investigate the differential reactivity of two ruthenium (II) precursors with a trimethoxyarylimino-phenol derivative.
  • To explore the subsequent reactions of oxidized ruthenium species and their impact on bond formation.

Main Methods:

  • Synthesis and characterization of ruthenium (II/III) complexes.
  • Single-crystal X-ray crystallography.
  • Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • [Ru(PPh3)3Cl2] precursor yields methoxy demethylation and a [Phenolato-RuIII-Phenolato] unit.
  • [Ru(PPh3)3(CO)(H)Cl] precursor leads to C-H activation and a [Phenolato-RuII-Aryl] unit.
  • Oxidized analogues exhibit diverse reactivities, including PPh3 oxidation, dimerization, C-C coupling, and H abstraction, forming unique ruthenium-centered products.

Conclusions:

  • Ligand environment significantly dictates the reaction pathway and product formation in ruthenium complexes.
  • The study highlights novel bond-forming reactions mediated by ruthenium, including Ru-Ru bond formation and C-C coupling.
  • The findings provide insights into the electronic and structural factors governing ruthenium reactivity and catalytic potential.