Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

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...
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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Ce(III) containing tricobalt-substituted silico-tungstate [CeCo<sub>3</sub>Si<sub>2</sub>W<sub>20</sub>O<sub>74</sub>(NO<sub>3</sub>)(OH)(H<sub>2</sub>O)]<sup>13-</sup>: a versatile nano-cluster with a multitude of applications.

Dalton transactions (Cambridge, England : 2003)·2026
Same author

Correlating luminescence and single-molecule magnetism for two series of heteroleptic lanthanoid complexes.

Dalton transactions (Cambridge, England : 2003)·2026
Same author

Evaluation of resistance modulation in MDR <i>Pseudomonas aeruginosa</i> and <i>Klebsiella pneumoniae</i> using peppermint oil nanoemulsion: integrating antibacterial assays and molecular modeling.

Frontiers in microbiology·2025
Same author

Non-PFAS-Based Magnetic Polymer Sorbents for Efficient Removal of Perfluorinated Compounds from Landfill Leachate.

Advanced materials (Deerfield Beach, Fla.)·2025
Same author

Enhancing redox functionality in dinuclear europium complexes.

Dalton transactions (Cambridge, England : 2003)·2025
Same author

Tuning the Electronic Properties of Tetravalent Cerium Complexes via Ligand Derivatization.

Inorganic chemistry·2025

Related Experiment Video

Updated: Jun 25, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
13:21

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Polyoxotungstate-encapsulated Gd(6) and Yb(10) complexes.

Firasat Hussain1, Robert W Gable, Manfred Speldrich

  • 1School of Chemistry, University of Melbourne, Victoria, 3010, Australia.

Chemical Communications (Cambridge, England)
|February 12, 2009
PubMed
Summary

Researchers developed a new method to create complex lanthanoid molecules within polyoxotungstates. This resulted in the largest gadolinium (Gd) complex and the first decanuclear ytterbium (Yb) complex of its kind.

More Related Videos

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Related Experiment Videos

Last Updated: Jun 25, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
13:21

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Polyoxometalates (POMs) are versatile inorganic clusters with diverse applications.
  • Lanthanoid complexes offer unique magnetic and luminescent properties.
  • Encapsulating lanthanoids within POMs presents challenges in controlling nuclearity and structure.

Purpose of the Study:

  • To develop a novel synthetic strategy for polynuclear lanthanoid complexes within polyoxotungstates.
  • To achieve unprecedented high nuclearity in lanthanoid-POM hybrids.
  • To structurally characterize novel gadolinium (Gd) and ytterbium (Yb) complexes.

Main Methods:

  • A new synthetic methodology was employed for the construction of lanthanoid-embedded polyoxotungstates.
  • Single-crystal X-ray diffraction was used for structural elucidation.
  • Advanced characterization techniques confirmed the composition and structure.

Main Results:

  • The highest nuclearity polyoxometalate-encapsulated Gd complex reported to date was synthesized.
  • The first structurally characterized decanuclear Yb complex of any type was obtained.
  • The synthetic method proved effective in controlling the assembly of polynuclear lanthanoid clusters.

Conclusions:

  • The developed synthetic route enables the creation of complex, high-nuclearity lanthanoid-POM architectures.
  • This work expands the scope of polyoxometalate chemistry and lanthanoid coordination compounds.
  • The characterized complexes serve as platforms for future investigations in magnetism and catalysis.