Fig. 2: The photoisomerization and protonation reaction of DSP-OH.
From: Dynamic wrinkling pattern exhibiting tunable fluorescence for anticounterfeiting applications
a UV–vis spectra of 4.0 × 10−5 mol L−1 DSP-OH toluene solution for different irradiation times of 450 nm light. b 1H NMR spectra of DSP-OH for different irradiation times of 450 nm light in CDCl3. c UV–vis spectra of 4.0 × 10−5 mol L−1 DSP-OH toluene solution with different concentration of CF3COOH. d Fluorescence emission spectra of 1.0 × 10−6 mol L−1 DSP-OH toluene solution with different concentration of CF3COOH. e The fluorescence color of 1.0 × 10−6 mol L−1 DSP-OH toluene solution with different concentration of CF3COOH is illustrated in the CIE color space.
