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Properties of Organometallic Compounds

Properties of Organometallic Compounds

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.

Valence Bond Theory

Valence 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...

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.

Metal-Ligand Bonds

Metal-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...

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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

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A mononuclear, terminal titanium(III) imido.

Jacob S Mohar¹, Anders Reinholdt¹, Taylor M Keller¹

¹Department of Chemistry, University of Pennsylvania, 231 S 34th Street, Philadelphia, Pennsylvania, USA. mindiola@sas.upenn.edu.

Chemical Communications (Cambridge, England)

|July 7, 2023

Summary

This summary is machine-generated.

This study introduces the first mononuclear titanium(III) complex with a terminal imido ligand. This novel metalloradical complex was synthesized and characterized using various spectroscopic and crystallographic methods.

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Area of Science:

Organometallic Chemistry
Inorganic Chemistry
Coordination Chemistry

Background:

Terminal imido ligands are crucial in transition metal chemistry.
Titanium complexes are versatile catalysts and reagents.
Understanding the electronic structure of d1 metal centers is key to reactivity.

Purpose of the Study:

To synthesize and characterize the first mononuclear titanium(III) complex with a terminal imido ligand.
To investigate the electronic properties and reactivity of this novel titanium-imido complex.
To establish a benchmark for future studies on titanium-imido chemistry.

Main Methods:

Synthesis of titanium complexes via reduction and salt metathesis reactions.
Characterization using single crystal X-ray diffraction, EPR, UV-Vis, and NMR spectroscopy.
Electrochemical studies to determine redox properties.

Main Results:

Successful synthesis and isolation of the mononuclear Ti(III)-imido complex [Tp*Ti(NSiMe3)(THF)] (2).
Confirmation of its metalloradical nature and d1 electronic configuration through spectroscopic and crystallographic analyses.
Demonstration of reversible electrochemistry and clean reactions with chemical oxidants.

Conclusions:

The reported titanium(III)-imido complex represents a significant advancement in organometallic chemistry.
Its unique electronic and structural features offer new avenues for catalytic applications.
This work provides a foundation for exploring the reactivity of titanium-imido complexes.