Contrary to the 2 ps hopping time of 3 TAB* in toluene, 𝑡 VM++W%WMX ≪ 𝜏 LMC = 8 ps is obtained in the viscous solvent (𝜂 = 1.05 mPa) in Table . This supports the hopping-mediated TTA in toluene (𝜂 = 0.56 mPa) with 𝑡 VM++W%WMX = 𝜏 LMC , because 𝑘 ((# ( 3 TAB*) < 𝑘 ((# ( 3 DPA*) (red plots of Figure ) denotes that the inhibited hopping results in the mismatch in the exchange interaction between the 3 TAB* molecules to reduce 𝑘 ((# significantly. The larger increase in 𝑘 ((# ( 3 TAB*) as shown by the solid arrow in Figure than the increase represented by the dashed arrow is thus rationalized by the enhanced 𝑘 ((# by the quick vibronic hopping in 3 TAB*.