Photoinduced Electron Transfer in Self-Assembled Dimers of 3-Fold Symmetric Donor−Acceptor Molecules Based on Perylene-3,4:9,10-bis(dicarboximide)

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Abstract

The influence of π-stacking on photoinduced electron transfer in a series of donor−acceptor molecules attached to a 3-fold symmetric scaffold was studied. The donor−acceptor unit is a DEA−PDI pair (DEA = N,N-diethylaniline; PDI = perylene-3,4:9,10-bis(dicarboximide)), in which the 4-position of DEA is covalently attached to the nitrogen atom of one imide of PDI. One, two, or three DEA−PDI units are attached to the para position of one of the phenyl groups of 1,3,5-triphenylbenzene, using the other PDI imide group to form mono-, bis-, and tris(DEA−PDI). These molecules demonstrate an increasing tendency to self-assemble into π-stacked dimers in solution in the order mono(DEA−PDI) ≪ bis(DEA−PDI) < tris(DEA−PDI). Photoinduced electron transfer in both the monomers and self-assembled dimers was studied by femtosecond transient absorption spectroscopy. The charge separation (CS) and charge recombination time (CR) constants are found to be independent of π-stacking aptitudes, while the transient spectral features differ significantly upon dimerization. The electronic interactions imposed by π-stacking appear to change the energies of the ground, excited, and ionic states of DEA−PDI to a similar extent, which results in similar energies for CS and CR within the monomers and dimers.

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