Fig. 2
From: A building-block design for enhanced visible-light switching of diarylethenes
Photochromic properties of the visible-light-driven DAE-o-DT in solution. a Absorption spectra changes of DAE-o-DT (2.0 × 10−5 M) in deaerated toluene before (black) and after irradiation with 313 nm (blue dash) and with 420 nm (red solid); absorption spectra of DT (4.0 × 10−5 M, purple) and DAE-1o (1.0 × 10−5 M, green dash). b The photochromic performance of DAE-o-DT (2.0 × 10−5 M) under alternate 420 nm/>550 nm irradiation. Insets: photographs of color changes of DAE-o-DT in deaerated toluene before and after irradiation. c Absorbance of DAE-DT (2.0 × 10−5 M) in PSS at 530 nm in deaerated toluene during repetitive switching cycles consisting of alternate 420 nm/>550 nm irradiation (triplet excitation, black) and 313 nm/>550 nm irradiation (singlet excitation, red). Irradiation was carried out by an Hg/Xe lamp (200 W) equipped with a narrow band interference filter for λ = 420 nm and a broad band interference filter for λ > 550 nm. d The photoswitchable fluorescence performance of DAE-DT (2.0 × 10−5 M) under alternate 420 nm/>550 nm irradiation. Insets: photographs of fluorescence changes of DAE-DT in deaerated toluene before and after irradiation
