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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Step-by-Step Real-Time Electron Paramagnetic Resonance Monitored Protocol for Synthesizing a Nitroxide-Functionalized

Tiago Morais1,2, Satyaki Chatterjee2, Mirtha A O Lourenço1

  • 1CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.

Chemistry of Materials : a Publication of the American Chemical Society
|June 29, 2026
PubMed
Summary

This study details a reproducible 22-day protocol for synthesizing periodic mesoporous organosilica (PMO) materials. The method successfully embeds nitroxide monoradicals within the PMO structure without altering its properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Chemistry

Background:

  • Periodic mesoporous organosilica (PMO) materials offer tunable structures for various applications.
  • Incorporating functional radicals into PMO frameworks can lead to novel magnetic or catalytic properties.
  • A robust synthesis protocol is needed for reliable radical incorporation.

Purpose of the Study:

  • To develop a step-by-step protocol for synthesizing PMO with wall-embedded nitroxide monoradicals.
  • To demonstrate the successful in situ incorporation of nitroxide radicals into phenylene-PMO (Ph-PMO).
  • To confirm that radical incorporation does not negatively impact the PMO structure.

Main Methods:

  • Synthesis of an isoindoline-based nitroxide monoradical and its silylation.
  • Preparation of the 1,4-bis-(triethoxysilyl)-benzene (BTEB) precursor for Ph-PMO.
  • In situ condensation of the silylated radical with BTEB to form radical-containing Ph-PMO.
  • Characterization using electron paramagnetic resonance (EPR), powder X-ray diffraction (PXRD), N2 adsorption-desorption, TGA, and FTIR-ATR.

Main Results:

  • A reproducible 22-day protocol for synthesizing PMO with embedded nitroxide monoradicals was established.
  • Electron paramagnetic resonance (EPR) confirmed the successful incorporation and reduced free radical concentration in solution during condensation.
  • Structural characterization (PXRD, N2 adsorption, TGA, FTIR-ATR) showed no significant changes in the PMO framework due to radical incorporation.

Conclusions:

  • The developed protocol enables the synthesis of nitroxide-functionalized Ph-PMO materials.
  • The embedded nitroxide radicals do not disrupt the mesoporous structure of the organosilica.
  • This method provides a reliable route for creating functionalized PMO materials for advanced applications.