“…[25, 15a] In these systems,e lectron density is transferred from the electron-rich core to either the N-aryl or core substituent, generating as hift in charge density within the molecule in its excited state,w hich is dictated by the electron-accepting ability of the aryl "acceptor" as well as the environment surrounding the "donor" tricyclic core.T he connection between PC CT and superior O-ATRP performance was investigated in two separate studies,but different conclusions were drawn:F or N-aryl phenoxazines,increasing CT character has been shown to augment triplet yields, positing that higher concentrations of 3 PC* promotes fast activation. [27] Conversely,s tudies with N,N-diaryl dihydrophenazine PCs suggest that CT lowers *PC reduction potentials,slowing down activation, reducing radical concentrations,and minimizing termination. [15c] Computationally,C Tc haracteristics can be predicted through the presence of charge-separated singly occupied molecular orbitals (SOMOs) for 3 PC*.…”