Fig. 5: Photochromism studies of 1 towards tetraarylborates.
From: Charge-transfer complexation of coordination cages for enhanced photochromism and photocatalysis
a UV-vis spectra of 1-BArF (190 µM) in air-free methanol upon Xe lamp irradiation for different periods of time. Insets: the reversible color changes upon irradiation and exposure to air. b Photochromic kinetics of 1-OTf (65 µM) in air-free methanol in the presence of 6 equiv. tetraarylborates. Insets: saturation color of the solutions. c Scheme illustrating PET from BArF− to V2+ and ET from V•+ to O2. d ESR spectra (CH3OH, 9.82 GHz, 298 K) of 1-BArF and L1-BArF irradiated under oxygen-free conditions. e ESR spectra (CH3OH, 9.82 GHz, 298 K) of 1-BArF and L1-BArF irradiated in the presence of O2 and DMPO. f Solvent effect on color-fading kinetics of irradiated 1-BArF (190 µM) upon exposure to air. g Anion effect (8 equiv.) on photochromism of 1-BArF (190 µM) in CH3OH.
