Marcus theory is typically used for donor-acceptor systems, when the molecular interface is important to the photophysics, or when charge transfer states are of import. Bai and co-workers depending on the molecular configuration. Of the three studied conformations (face-on, edge-on, and end-on), the fastest rate constant was for the face-on geometry, with a rate of 5.71×10 6 s -1 . Slowest was for the edge-on geometry with a rate of 1.94×10 -1 s -1 , with end-on being in the middle (1.10×10 3 s -1 ). This sensitivity is likely a symptom of the strong dispersion between the two molecular fragments, with energy levels shifting as a function of the orientation. However, based on the orbital configuration for each of the geometries (Figure ), it is apparent that the electron density has a stronger degree of overlap for a face-on configuration compared to an edge-on geometry. There may also be some interchromophore coupling between the two moieties increasing the vibronic coupling of the dimer system, based on the curving geometry of the planar fragment.