Near-infrared II photochromic behavior triggered by green light in an in situ protonated dithienylethene functionalized by quinoxalinone moieties

A novel quinoxalinone-functionalized A–D–A type DTE is developed. Its protonated derivative displays an unprecedented green light-triggered NIR II photochromism in the presence of TFA, which is the first case of NIR II photochromic DTE.