The main results of the SH dynamic are summarized in Figure and in ESI and show a rather complex behaviour confirming the interplay between ISC and H-transfer. The evolution of the population of the different states (Figure ) allows to underline some rather evident effects. Due to the difference in the oscillator strength we have considered that only the S1 state will be populated after the initial excitation. However, after a few fs we may observe a redistribution of the population between S1 and S2 states, which is also due to the breaking of the symmetry and to a partial mixing of the np* and pp* character, as also seen by the strong oscillation in the respective populations.