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Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

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...

Structural Isomerism

Structural 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...

Coordination Number and Geometry

Coordination 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.

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...

Complexometric Titration: Ligands

Complexometric Titration: Ligands

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...

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Related Experiment Video

Updated: Mar 1, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Ionic liquid promotes N₂ coordination to titanocene(iii) monochloride.

Akira Katayama¹, Tomohiko Inomata, Tomohiro Ozawa

¹Department of Cooperative Major in Nanopharmaceutical Sciences, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan.

Dalton Transactions (Cambridge, England : 2003)

|June 3, 2017

Summary

This study shows that nitrogen (N₂) can coordinate to titanium chloride complexes in ionic liquids. The ionic liquid Pyr₄FAP facilitates this nitrogen coordination to the titanium(III) center.

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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

Published on: February 23, 2016

Area of Science:

Organometallic Chemistry
Coordination Chemistry
Materials Science

Background:

Titanium chloride complexes, such as bis(cyclopentadienyl)titanium(III) chloride, exist in equilibrium between monomeric and dimeric forms.
Ionic liquids offer unique non-coordinating environments for studying reactive metal complexes.
Nitrogen (N₂) coordination to transition metals is a key step in nitrogen fixation research.

Purpose of the Study:

To investigate the coordination of N₂ to titanium chloride complexes in a non-coordinating ionic liquid.
To determine the role of the ionic liquid, tetrabutylammonium tetrafluoroborate (Pyr₄FAP), in promoting N₂ coordination.
To elucidate the species involved in the equilibrium of the titanium complex under these conditions.

Main Methods:

UV-vis/NIR spectroscopy to monitor electronic transitions.
Electron Paramagnetic Resonance (EPR) spectroscopy to detect paramagnetic Ti(III) species and N₂ coordination.
Use of a non-coordinating ionic liquid, Pyr₄FAP, as the reaction medium.

Main Results:

The titanium complex [(Cp₂TiCl)₂] was observed to be in equilibrium with its monomeric form [Cp₂TiCl].
EPR spectroscopy confirmed the coordination of N₂ to the monomeric titanium(III) species [Cp₂TiCl].
The ionic liquid Pyr₄FAP was found to promote N₂ coordination to the titanium center.

Conclusions:

The non-coordinating ionic liquid Pyr₄FAP facilitates the coordination of N₂ to [Cp₂TiCl].
This finding highlights the potential of ionic liquids in stabilizing reactive intermediates for N₂ activation.
The study provides insights into the mechanism of N₂ coordination to early transition metal complexes.