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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.

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...

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...

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...

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.

Properties of Transition Metals

Properties of Transition Metals

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.

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Related Experiment Video

Updated: Apr 20, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

An Ir(IV)-containing polyoxometalate.

Sergey A Adonin¹, Natalya V Izarova, Claire Besson

¹Nikolaev Institute of Inorganic Chemistry SB RAS, 630090 Novosibirsk, Russia. caesar@niic.nsc.ru.

Chemical Communications (Cambridge, England)

|December 4, 2014

Summary

This summary is machine-generated.

Researchers synthesized the first iridium-containing Anderson-Evans-type polyanion, [HIrW6O24](7-). This novel polyoxometalate exhibits reversible redox behavior, allowing for the formation of Ir(III) and Ir(V) species.

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Last Updated: Apr 20, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

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Area of Science:

Inorganic Chemistry
Materials Science
Coordination Chemistry

Background:

Polyoxometalates (POMs) are versatile inorganic clusters with diverse structures and applications.
Iridium-based POMs are less explored compared to other transition metals.
Anderson-Evans type POMs offer a unique structural motif for incorporating different metal ions.

Purpose of the Study:

To synthesize and characterize the first Anderson-Evans-type polyanion containing iridium.
To investigate the structural and redox properties of the novel iridium polyoxometalate.
To explore the potential for redox manipulation of iridium oxidation states within the polyoxometalate framework.

Main Methods:

Single-crystal X-ray diffraction for structural determination.
Mass spectrometry for molecular weight confirmation.
Spectroscopic techniques including IR, UV-Vis, and EPR for characterization.
Cyclic voltammetry to study redox behavior.

Main Results:

Successful isolation and structural characterization of the hydrated sodium salt of [HIrW6O24](7-).
Confirmation of the compound as the first Ir-containing Anderson-Evans-type polyanion and the first structurally characterized Ir(IV)-based polyoxometalate.
Demonstration of reversible one-electron reduction and oxidation of Ir(IV) ions using cyclic voltammetry.
Identification of accessible Ir(III) and Ir(V) derivatives.

Conclusions:

The synthesis of [HIrW6O24](7-) expands the family of Anderson-Evans-type polyoxometalates.
The characterized Ir(IV)-based polyoxometalate exhibits tunable redox properties.
This work opens avenues for exploring new iridium-containing POMs with potential applications in catalysis and electrochemistry.