and weakly coupled mAdTc2. The quintet form of (T1T1), namely 5 (T1T1), is an intermediate along the dissociation of 1 (T1T1) in dimeric systems. The deconvolution of 1 (T1T1) and 5 (T1T1) failed as both states are indistinguishable by means optical spectroscopy. Thus, we 8 refer to (T1T1) rather than 1 (T1T1) or 5 (T1T1). The short 9 lifetime of (T1T1), especially for mPhTc2, suggests that TTA 10 is active. As a matter of fact, TTA represents a competitive 11 deactivation pathway to the decoherence of (T1T1). Triplet quantum yields (ΦT) for mPhTc2 and mAdTc2