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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
The Born-Haber Cycle02:44

The Born-Haber Cycle

Lattice Energy
Crown Ethers02:36

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules take.
Electron Affinity03:07

Electron Affinity

The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).

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Related Experiment Video

Updated: Jun 10, 2026

18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor (SiFA) for Positron Emission Tomography
09:57

18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor (SiFA) for Positron Emission Tomography

Published on: January 11, 2020

Caesium ion sequestration by a fluoro-metallocrown [16]-MC-8.

Thomas B Faust1, Paul G Heath, Christopher A Muryn

  • 1School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.

Chemical Communications (Cambridge, England)
|August 10, 2010
PubMed
Summary

A novel fluoro-metallocrown selectively captures caesium (Cs) from water. The binding process is effectively monitored using proton nuclear magnetic resonance ((1)H-NMR) spectroscopy on paramagnetic complexes.

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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter

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Last Updated: Jun 10, 2026

18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor (SiFA) for Positron Emission Tomography
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18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor (SiFA) for Positron Emission Tomography

Published on: January 11, 2020

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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter

Published on: July 13, 2018

Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Radiochemistry

Background:

  • Selective ion extraction is crucial for environmental remediation and nuclear waste management.
  • Metallocrown ethers offer tunable selectivity for various metal ions.
  • Developing efficient monitoring techniques for ion binding is essential.

Purpose of the Study:

  • To synthesize and characterize a fluoro-metallocrown for selective caesium binding.
  • To investigate the extraction efficiency of the fluoro-metallocrown for caesium from aqueous solutions.
  • To establish a spectroscopic method for monitoring caesium binding.

Main Methods:

  • Synthesis of a novel fluoro-metallocrown complex.
  • Liquid-liquid extraction of caesium from aqueous to organic phases.
  • Characterization of caesium binding using proton nuclear magnetic resonance ((1)H-NMR) spectroscopy on paramagnetic complexes.

Main Results:

  • The fluoro-metallocrown demonstrated selective binding and extraction of caesium.
  • Successful monitoring of caesium binding was achieved via (1)H-NMR.
  • The paramagnetic nature of the complexes facilitated NMR-based detection.

Conclusions:

  • Fluoro-metallocrowns are effective agents for selective caesium extraction.
  • (1)H-NMR of paramagnetic complexes provides a viable method for monitoring caesium binding.
  • This approach holds potential for applications in caesium separation and detection.