In Fig. , we represent the lowest excited state for 2a and 2b. The topology of these transitions are obviously similar, with the NPh2 units acting as donors groups and the P-containing core of the dye playing the role of the acceptor. The ICT seems a bit stronger from the group located at the 2-position of the phosphole, whereas the impact of the methoxy substituents is rather limited, which is unsurprising given the already strong donating character of the NPh2 groups. Let us now focus on 2c, see Fig. : the two weakly allowed transitions correspond to pure CT states from the phenoxazine to the dye core, but the almost perpendicular nature of the two -conjugated (sub)systems makes these absorptions nearly dark. The strong absorption at higher energy is localized on the dye core. This means that the difference in absorption spectra between the various dyes is mainly a consequence of the geometrical constraints: while the diphenylamine is electronically connected to the P-bearing cycles thanks to its propeller shape, the orthogonality of the phenoxazine cuts such direct connection and only through-space ICT takes place.