Efficient Synthesis and Properties of a Novel Unsymmetrical Photochromic Diarylethene Material Based on Pyrazolyl Group
An unsymmetrical diarylethene derivative was synthesized, and its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 574 nm in hexane and at 579 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The diarylethene 1a in hexane solution exhibited relatively strong fluorescence at 413 nm when excited at 322 nm. The fluorscence intensity is highest at the concentration of 1.0×10-4 mol/L when excited at 322 nm.
Helen Zhang and David Jin
W. J. Liu et al., "Efficient Synthesis and Properties of a Novel Unsymmetrical Photochromic Diarylethene Material Based on Pyrazolyl Group", Applied Mechanics and Materials, Vol. 164, pp. 280-283, 2012