We report a new type of fast photochromic imidazole dimer, pentaarylbiimidazole (PABI), which shows a few μs fast photochromism with high fatigue resistance against light irradiation. PABI has an unusual spiroconjugated imidazoisoindole skeleton and its derivatives can be prepared by simple synthetic procedures.
H. Yamashita and J. Abe, Chem. Commun., 2014, 50, 8468 DOI: 10.1039/C4CC03137G
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