Figure 3
From: Mechanistic insights into photochromic 3H-naphthopyran showing strong photocoloration
(a) Kinetics of the changes in absorption as a result of UV irradiation (4.1 mW/cm2) in the period of 60 s for 2 and the reference 1 in cyclohexane at 21 °C (both solutions prepared with the same absorbance A(365 nm, 1 cm) = 0.24). (b) Transient UV–vis absorption spectra for 2 after switching off UV irradiation. (c) Decay associated spectra of the TC (17.1 s and 17.5 min) and TT isomers (the offset, long-lived population) obtained by global analysis using a biexponential function.
