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Related Concept Videos

Properties of Organometallic Compounds01:23

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.
Properties of Transition Metals02:58

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.
Metal-Ligand Bonds02:51

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...
Coordination Number and Geometry02:57

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.
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
Complexometric Titration: Ligands00:43

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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Updated: May 19, 2026

High Resolution Physical Characterization of Single Metallic Nanoparticles
09:56

High Resolution Physical Characterization of Single Metallic Nanoparticles

Published on: June 28, 2019

Noble metals in polyoxometalates.

Natalya V Izarova1, Michael T Pope, Ulrich Kortz

  • 1Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen, Germany. n.izarova@jacobs-university.de

Angewandte Chemie (International Ed. in English)
|August 22, 2012
PubMed
Summary
This summary is machine-generated.

Noble metal polyoxometalates are structurally diverse, offering potential in catalysis and nanoscience. This review focuses on discrete molecular species for future synthetic utility and reactivity.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Catalysis

Background:

  • Polyoxometalates (POMs) are versatile inorganic clusters.
  • Noble metals (e.g., Ru, Pt, Au) can be incorporated into POM structures.
  • Two main classes exist: noble metals as heteroatoms or as addenda atoms.

Purpose of the Study:

  • To review discrete molecular polyoxometalates containing noble metals.
  • To highlight their potential in catalysis and nanoscience.
  • To discuss their synthetic utility and reactivity.

Main Methods:

  • Literature review of polyoxometalate chemistry.
  • Focus on structurally characterized discrete molecular species.
  • Analysis of reported reactivity and applications.

Main Results:

  • Structurally diverse POMs incorporating noble metals have been identified.
  • Both heteroatom and addenda metal incorporation are observed.
  • These compounds exhibit interesting reactivity profiles.

Conclusions:

  • Discrete noble metal polyoxometalates represent a promising area for chemical synthesis.
  • Their unique structures suggest significant potential in catalysis and nanoscience.
  • Further research into their reactivity and applications is warranted.