Development of photochromic fused 2H-naphthopyrans with promising thermal fading rates

Abstract

Tuning the thermal fading rate within several seconds while maintaining ideal colorability is a bottleneck problem for the industrial applications of photochromic naphthopyrans. Herein, a series of new photochromic 2,2,6-triaryl...

Nonadiabatic molecular dynamics simulations for ultrafast photo-induced ring-opening and isomerization reactions of 2,2-diphenyl-2H-chromene

“…Chromenes with 2,2-diphenylbenzopyran (also namely as 2,2-diphenyl-2H-chromene, DPC (see Fig. 1)) have attracted increasing interest for both their fundamental scientific significance [1][2][3] and their technique applications 4,5 with their specialized photocoloration under UV irradiation and thermal (T-type) or visible-light (P-type) triggered fast color fading. The underlying essences of such photochromic phenomenon are associated with the bidirectional isomerization transformation between the colorless closed form (CF) and the colored open form (OF) via the intermediate C(spiro)-O bond of the pyran ring and the reversible sequential isomerization among metastable cisoid-cis (CC), transoid-cis (TC) and transoid-trans (TT) conformers.…”