Conjugation-Driven Stabilization of a Dibenzo[ <i>a</i> , <i>j</i> ]-perylene Radical Cation Exhibiting NIR Electrochromism

Abstract A new stabilization concept for triarylmethyl species was demonstrated through electronic coupling with a triarylmethylium unit via conjugation. The resulting dibenzo[a,j]perylene radical cation was successfully isolated as a stable salt, showing reversible interconversion with its neutral form. DFT and spectroscopic analyses revealed delocalized spin distribution and strong NIR absorption up to 1250 nm, establishing this system as a promising NIR electrochromic material.