Mixed-halide triphenyl methyl radicals for site-selective functionalization and polymerization

Area of Science:

• Organic Chemistry
• Materials Science
• Spin Chemistry

Background:

• Tris-2,4,6-trichlorophenylmethyl (TTM) radicals possess unique doublet spin properties valuable for optoelectronics, spintronics, and energy storage.
• Limited reactivity of chloride moieties in TTM derivatives restricts functionalization and the development of high-performance luminescent radicals.

Purpose of the Study:

• To develop a novel synthetic pathway for mixed-halide TTM derivatives.
• To enhance the stability and reactivity of luminescent radicals for broader applications.

Main Methods:

• Friedel-Crafts alkylation was employed to synthesize mixed-bromide and chloride TTM derivatives.
• Characterization of the resulting radical compounds and their reactivity in cross-coupling reactions.

Main Results:

• Successfully synthesized mixed-halide TTM radicals with improved stability and site-specific reactivity.
• The para-bromide moiety acts as a better leaving group, facilitating cross-coupling reactions.
• Enabled access to complex luminescent open-shell small molecules and polymers containing radical centers.

Conclusions:

• Mixed-halide TTM radicals offer a versatile platform for designing and synthesizing stable, luminescent open-shell molecules and materials.
• This approach overcomes previous limitations in functionalization, opening new avenues for radical-based technologies.