Please do not adjust margins Please do not adjust margins still informative. By this method the Pd(II)-C BDFE in T-shaped 1a is estimated to weaken by 20 kcal/mol in the triplet excited state. Similarly, the Pd(II)-C bond in α-diimine complex S3 is estimated to weaken by 28 kcal/mol in the triplet excited state. These data further corroborate the feasibility of facile homolysis of otherwise strong Pd(II)-C(sp 3 ) bonds upon visible light excitation at ambient temperature.