Design and synthesis of reversible solid-state photochromic pyrazolones by introducing a pyridine ring

Abstract

We demonstrate a new strategy for designing reversibility, fatigue resistance and fluorescence switching materials, which are based on pyrazolone derivatives by introducing a pyridine ring. The reversible "on" and "off" modulation of fluorescence emission was up to 95% in the solid state.

Photoinduced debenzylation of 2,5-bis(dibenzylamino)-3,6-dichloro- p -benzoquinone

“…Photochromic dyes are a typical example of light-functional dyes [1][2][3][4][5][6][7][8][9][10][11], which undergo structural changes upon photochemical reactions such as photoelimination, photocyclization, and photoisomerization. Photodegradation is a particularly important photoreaction of dyes.…”

Synthesis, mechanism and efficient modulation of a fluorescence dye by photochromic pyrazolone with energy transfer in the crystalline state

“…However, most of pyrazolones synthesized previously showcase irrevocable or partly reversible photochromic reactions by alternating stimulation of UV light and heating or visible light. [24][25][26][27][28] In this work, a novel photochromic compound 1 with a substituted pyridine ring on the 4-position of pyrazolone ring was designed and fabricated. Photochromic compound 1 displays dual-responded reversible photochromic reactions excluding the poor uorescent contrast in crystalline state.…”