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Radical Reactivity: Steric Effects01:10

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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.
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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...
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Radical-Stabilizing Supramolecular Metallacage for Near-Infrared Photothermal Therapy.

Qing-Hui Ling1,2, You Dou3, Tongxia Jin2

  • 1School of Pharmacy, Anhui Institute of Medicine, Hefei, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 16, 2026
PubMed
Summary

Researchers developed a stable NDI-based metallacage for efficient photothermal therapy (PTT). This novel material overcomes the instability of radical anions, showing promise for advanced cancer treatments.

Keywords:
coordination‐driven self‐assemblymetallacagenaphthalene diimidephotothermal therapyradical anion

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Photothermal therapy (PTT) requires efficient and stable photothermal agents.
  • Naphthalene diimide (NDI) derivatives absorb near-infrared (NIR) light but suffer from unstable radical anions.
  • Existing NDI materials' instability limits their application in PTT.

Purpose of the Study:

  • To design and synthesize a stable NDI-based metallacage for enhanced photothermal conversion.
  • To improve the stability of NDI radical anions for practical PTT applications.
  • To establish a versatile platform for developing new photothermal agents.

Main Methods:

  • Synthesis of a core-substituted NDI-based tetrahedral metallacage.
  • Incorporation of cyano groups to lower the LUMO energy level.
  • Characterization of radical anion stability and photothermal conversion efficiency.
  • In vitro and in vivo evaluation of biocompatibility and therapeutic efficacy.

Main Results:

  • The NDI-based metallacage demonstrated enhanced radical anion stability in air.
  • Achieved outstanding photothermal conversion efficiency.
  • The 3D metallacage architecture protected radical species from degradation.
  • Confirmed excellent biocompatibility and potent therapeutic efficacy in vitro and in vivo.

Conclusions:

  • A robust supramolecular strategy effectively stabilizes NDI radical anions.
  • The developed NDI-based metallacage is a promising agent for photothermal therapy.
  • This work provides a general and accessible platform for novel photothermal agent development.