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Related Concept Videos

Crown Ethers02:36

Crown Ethers

6.2K
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...
6.2K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

2.3K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
2.3K
Radical Formation: Addition00:47

Radical Formation: Addition

2.4K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
2.4K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.6K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
2.6K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.7K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.7K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.7K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
3.7K

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Post-synthetically modified crown ether-based supramolecular framework for efficient radium sequestration.

Wenchang Wang1, Wenya Tai1,2, Jiahao Lou1

  • 1College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.

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Engineered a novel zirconium-based metal-organic framework (MOF) for efficient radium-226 removal from high-activity nuclear waste. This material offers superior selectivity and performance compared to existing sorbents.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nuclear Engineering

Background:

  • Uranium tailings pose environmental risks due to persistent radium-226 (226Ra) contamination.
  • Existing 226Ra sorbents are ineffective in high-activity scenarios (>104 Bq L-1).

Purpose of the Study:

  • To engineer a high-performance sorbent for efficient 226Ra2+ removal from acute radioactive contamination.
  • To investigate the sorption mechanism of the novel material at a molecular level.

Main Methods:

  • Synthesis of a bifunctional Zr-MOF (ZJU-X100-SO4) with crown-ether and sulfate groups.
  • Sorption experiments with high-activity 226Ra2+ solutions and competing ions.
  • Characterization using XAFS, SC-XRD, and DFT calculations.

Main Results:

  • Achieved 83% 226Ra2+ removal in 10 minutes from 40000 Bq L-1 solution.
  • Demonstrated excellent selectivity against 106-fold excess competing ions and strong acidic conditions.
  • Outperformed synthesized ferrihydrite and commercial sorbents.

Conclusions:

  • The engineered Zr-MOF provides a practical solution for emergency radionuclide containment.
  • The study offers fundamental insights into designing high-performance sorbents for nuclear waste management.
  • A multi-site binding mechanism involving supramolecular trapping, size-matching, and chelation was elucidated.