where the absolute temperature 𝑇 is 298.15 K, and the transmission coefficient 𝜅 was taken equal to one. For each process, the activation Gibbs's free energy, Δ𝐺 ‡ , including vibrational and thermal In this specific case, we assumed Δ𝐺 ‡ = 0, as the vibrational zero-point energy contributions lift the small reaction barrier on the electronic PES. This is true not only for structures characterized by extremely weak oscillator strengths (2, 4, 7, and 8) but also for those with relatively short fluorescence lifetimes (1, 3.2, 5, and 6), as the latter ones were consistently found to be about 3 orders of magnitude longer (i.e., in the nanoseconds timescale).