). This collection of energetically close excited states (Figure ), comprising numerous CT states spread across the different fins of 2 and a larger number of 3 LE states than for 1, is highly encouraging for accelerated delayed fluorescence in 2. Spin-orbit coupling (SOC) is essential to permit the formally forbidden spin-flip associated with rISC. Hence, the merit of the manifold of triplet states predicted for 2 was investigated by calculating the spin-orbit coupling matrix elements (SOCMEs) for the ground state optimized structure (TD-PBE0/def2svp and PySOC script ). The relevant states were probed via electron-hole analysis with the Multiwfn program to determine their CT or LE character. Detailed electron-hole analysis and assignment of excited state character are presented in the ESI (section 6, Table .1). Some relevant natural transition orbitals (NTOs) for 2 are shown in Figure . The fins of 2 in Figure are denoted A, B and C to aid discussion of the spatial distribution of states. Data for S1, T1, and triplet states with SOCME > 0.1 cm -1 to S1 within < 0.4 eV of T1 are summarized in Table for 1 and 2.