477706-43-7Relevant academic research and scientific papers
Synthesis of novel thermally irreversible photochromic 1-aryl-1,3-butadiene derivatives
Shrestha, Sujen Man,Nagashima, Hitoshi,Yokoyama, Yayoi,Yokoyama, Yasushi
, p. 363 - 367 (2003)
A new thermally irreversible photochromic compound, 3,3,4,4,5,5-hexafluoro-1-(1-isopropylidene-1-phenylmethyl)-2- (2,4,5-trimethyl-3-thienyl)cyclopentene 30, was synthesized and its photochromic properties were examined. It showed thermally irreversible photochromism. While 30 is colorless, it turned yellow (λmax 445 nm) upon the irradiation of 313-nm light, caused by the generation of 3C as the result of photochemical 6π-electrocyclization. It returned to the initial colorless state by 405-nm light irradiation. The coloration and decoloration quantum yields with 313-nm light were 0.43 and 0.14, respectively, and the decoloration quantum yield with 405-nm light was 0.16. The colored form 3C in a PMMA film did not fade when stored at 80 °C for more than one month, and the fatigue resistivity in the PMMA film for iterative irradiation was excellent.
