Single-Molecule Magnetoluminescence from a Spatially Confined Persistent Diradical Emitter

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Luminescent radicals possess unique photofunctions due to their open-shell electronic structure.
• Magnetoluminescence (ML), where magnetic fields influence luminescence, is a key photofunction with potential in spin photonics.
• Previous ML studies in radicals were limited to doped or polymerized systems.

Purpose of the Study:

• To demonstrate ML as a single-molecular property in luminescent radicals.
• To elucidate the requirements and mechanisms underlying ML in radical systems.
• To guide the rational design of novel ML-active radicals through synthetic chemistry.

Main Methods:

• Synthesis of a covalently linked luminescent radical dimer (diradical).
• Characterization of the diradical's photophysical and magnetoluminescent properties.
• Analysis of ML as an intrinsic property of the single diradical molecule.

Main Results:

• The synthesized diradical exhibited ML as a single-molecular property.
• This observation overcomes limitations of previous studies using doped or polymerized radicals.
• The findings provide a platform for detailed mechanistic studies of ML in radicals.

Conclusions:

• Covalently linked diradicals can exhibit intrinsic magnetoluminescence.
• This work facilitates a deeper understanding of ML mechanisms in radical materials.
• The study paves the way for designing advanced spin photonics materials based on synthetic radicals.