Fig. 5. Kinetic profiles of proximal-2H2O (total concentration, [2H2O]total = 2.7 mM) in the repeated cycles of photoisomerization and thermal isomerization. The ratios of the proximal isomer were calculated from the peak integration of the proximal isomer at 8.72 ppm (1H) and the distal isomer at 8.15 ppm (4H). Conditions: light source λ > 380 nm, T = 293 K under the light irradiation, T = 323 K in the dark reaction, solvent D2O.
