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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Solid-State Physics

Background:

  • Organic radicals possess unique spin-correlated electronic and magnetic properties.
  • Luminescence properties arising from spin interactions in organic radicals are rarely reported.
  • Magnetoluminescence, the effect of magnetic fields on luminescence, has been observed primarily in radicals dispersed in host matrices.

Purpose of the Study:

  • To report a novel method for achieving radical magnetoluminescence in radical-based coordination polymers (CPs).
  • To investigate the luminescence properties of specific organic radicals (bisPyTM and trisPyM) and their Zn(II) CPs.
  • To explore the influence of external magnetic fields on the luminescence of these radical-based CPs.

Main Methods:

  • Synthesis and characterization of radical-based coordination polymers (CPs) using bis(3,5-dichloro-4-pyridyl)(2,4,6-trichlorophenyl)methyl (bisPyTM) and tris(3,5-dichloro-4-pyridyl)methyl (trisPyM) radicals.
  • Investigation of solid-state luminescence properties at low temperatures (4.2 K).
  • Analysis of crystal structures, magnetic properties, and temperature-dependent/time-resolved magnetoluminescence.

Main Results:

  • Solid-state emissions of bisPyTM and trisPyM radicals were not significantly affected by external magnetic fields at 4.2 K.
  • Luminescence of the radical-based CPs was greatly modulated by external magnetic fields.
  • Studies suggest that reducing radical-radical interactions within CPs is crucial for achieving magnetoluminescence.

Conclusions:

  • Radical-based coordination polymers offer a novel platform for observing radical magnetoluminescence.
  • The modulation of luminescence by magnetic fields in CPs is significantly greater than in dispersed radicals.
  • Minimizing radical-radical interactions is a key strategy for developing materials with tunable magnetoluminescence properties.