Supplemental material

Additional computational details are provided including structural metrics of the investigated complexes, TD-DFT calculated energy gaps and transition dipole moments, weights of the individual monoexcitations contributing to the T1 state, details of singlet-singlet intensity borrowing including SOCME, admixture coefficients, individual transition dipole moments, energy gaps and contributions to the overall transition dipole moment; electron density difference distributions for the first six singlet-singlet transitions for all the studied complexes, plots of the permanent dipole moment of S0 and T1 states in 2 and their magnitudes, the sum of reorganization energies for different vibrational regions and the Cartesian coordinates of all the optimized structures.