Fig. 5. (a) General illustration of the low-lying singlet and triplet excited states of Pd-1 and Pt-1, and the calculated rate constants of different photophysical processes, in which the solid and dashed arrows represent radiative and non-radiative processes, respectively. Huang–Rhys factors for energy conversion between the S1 and S0 states of (b) Pd-1 and (c) Pt-1, as well as the displacement vectors of important vibrational modes with the largest value of Huang–Rhys factor.17 (d) Illustration of fluorescence quenching by the non-radiative channel in Pt-1.
