D˙–A radicals fabricated from polychlorinated trityl and pyridinium featuring a SOMO–LUMO electronic transition

D˙-A radicals 2a-2c were developed by combining polychlorinated trityl as a donor with pyridinium as an acceptor. The electron-deficient nature of the pyridinium unit significantly lowers the LUMO energy, thereby enabling SOMO-LUMO (α-type) electronic transitions, in contrast to conventional luminescent radicals that predominantly exhibit HOMO-SUMO (β-type) transitions.