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Related Concept Videos

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...
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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Valence Bond Theory02:42

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...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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.

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Related Experiment Video

Updated: Jun 20, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

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

Published on: April 10, 2015

Molybdenum(VI) dioxo complexes with tridentate phenolate ligands.

Martina E Judmaier1, Andreas Wallner, Gregor N Stipicic

  • 1Institut für Chemie, Bereich Anorganische Chemie, Karl-Franzens-Universität Graz, Schubertstrasse 1, 8010 Graz, Austria.

Inorganic Chemistry
|October 1, 2009
PubMed
Summary
This summary is machine-generated.

New molybdenum(VI) dioxo complexes were synthesized as molybdoenzyme models. DFT calculations and spectroscopy confirmed the structures and isomer formation of these novel compounds.

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Area of Science:

  • Inorganic Chemistry
  • Bioinorganic Chemistry
  • Organometallic Chemistry

Background:

  • Molybdoenzymes play crucial roles in biological systems.
  • Understanding the structure and reactivity of molybdenum complexes is key to mimicking enzyme function.
  • Novel molybdenum(VI) dioxo complexes serve as valuable models for studying these enzymes.

Purpose of the Study:

  • To synthesize and characterize new molybdenum(VI) dioxo complexes.
  • To investigate their structural properties and isomeric behavior.
  • To model the active sites of molybdoenzymes for mechanistic studies.

Main Methods:

  • Synthesis of molybdenum(VI) dioxo complexes using a pyrazolate precursor.
  • Ligand exchange reactions to form target complexes.
  • X-ray diffraction, elemental analysis, IR, UV/vis, NMR spectroscopy, and mass spectrometry for characterization.
  • Density Functional Theory (DFT) calculations for geometry optimization and isomer analysis.

Main Results:

  • Four new molybdenum(VI) dioxo complexes, [MoO(2)ClL(X)], were successfully synthesized.
  • X-ray diffraction confirmed a six-coordinate molybdenum atom with tridentate fac coordination for complexes 2 and 3.
  • Spectroscopic and DFT studies revealed the formation of one isomer for complexes 1 and 2, and two isomers for complexes 3 and 4.
  • Oxygen atom transfer reactions were demonstrated.

Conclusions:

  • The synthesized molybdenum(VI) dioxo complexes effectively model molybdoenzymes.
  • Structural and computational analyses provide insights into their coordination chemistry and isomerism.
  • These complexes offer a platform for further investigations into molybdenum-dependent enzymatic processes.