A poor charge transfer (CT) characteristic between FTiOPc and axial ligand C is observed due to the attraction of the C-F bonds to the electron cloud. In addition, the CT characteristic can be effectively improved by peripheral substitution of H-atoms or tetra--butyl groups, and superior one-/two-photon absorption properties can also be achieved owing to the σ-π hyperconjugation effect in tetra--butyl groups.
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