Pale yellow-to-dark blue electrochromic film produced by oxidation electropolymerization of a triphenylamine derivative with an enhanced electron-withdrawing group

The triphenylamine derivative with a terpyridine-like unit, {4-[p-(N,N-diphenylamino)-phenyl]-2,6-di(pyrazin-2-yl)pyridine}, and its doubly N-methylated salt have been successfully synthesized and characterized. The salt with much enhanced intramolecular D-A interaction shows a remarkable bathochromical shift of its absorption bands and a fluorescence quenching effect. And its oxidative electropolymerization film with tunable thickness and...