Furthermore, these data are unable to assign the origin of the strong dependence of 𝜏 !" on the length of the bridge molecule, i.e., even DQI compounds with anthracene bridge have unexpectedly fast SF. To capture these effects, we performed correlated-electron calculations of the excitonic states based on the π-electron only Pariser-Parr-Pople (PPP) model. A key feature of these calculations is that they include high order configuration interactions, which include quadruple excitations over a large active space (Methods and SI). Using this approach, we determine the wavefunctions and energies of (i) bright singlet states that are dominated by Frenkel exciton configurations localized on the SFC (denoted as LET, and LEP for tetracene and pentacene, respectively) and bridge moieties (𝐿𝐸 ' ), (ii) eigenstates with contributions from charge transfer . Previous theoretical treatment suggested that the triplet pair states are fundamentally different for DQI vs CQI compounds. Our calculations show that this result does not extend to bridges longer than 𝛽 = Ph. As seen in Figure the (𝑇𝑇) ( wavefunctions for a given SFC chromophore are nearly the same even with different bridge molecules.