In summary, the 1 ps dynamics indicate a high rate of ISC in 2-TP, an intermediate rate in 3-TP, and a notably slow singlet/triplet transition in 4-TP. Prior to ISC, the three isomers exhibit a rapid population decay to the lowest singlet state within 500 fs. For a detailed understanding of the photorelaxation pathways, we analyzed the transition matrices from the dynamical simulations. Table presents the difference transition matrix for each of the 9 ESM D simulations.