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Polyimide Dendrimers Containing Multiple Electron Donor–Acceptor Units and Their Unique Photophysical Properties
Author(s) -
Toma Francesca M.,
Puntoriero Fausto,
Pho Toan V.,
La Rosa Marcello,
Jun YoungSi,
Tremolet de Villers Bertrand J.,
Pavlovich James,
Stucky Galen D.,
Campagna Sebastiano,
Wudl Fred
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201501298
Subject(s) - dendrimer , perylene , polyimide , photochemistry , ultrafast laser spectroscopy , femtosecond , spectroscopy , absorption (acoustics) , branching (polymer chemistry) , chemistry , materials science , electron acceptor , absorption spectroscopy , acceptor , polymer chemistry , molecule , organic chemistry , laser , optics , physics , layer (electronics) , composite material , condensed matter physics , quantum mechanics
A high‐yielding synthesis of a series of polyimide dendrimers, including decacyclene‐ and perylene‐containing dendrimer D6 , in which two types of polyimide dyes are present, is reported. In these constructs, the branching unit is represented by trisphenylamine, and the solubilizing chains by N ‐9‐heptadecanyl‐substituted perylene diimides. The photophysical properties of the dendrimers have been studied by absorption, steady‐state, and time‐resolved emission spectroscopy and pump–probe transient absorption spectroscopy. Photoinduced charge‐separated (CS) states are formed on the femtosecond timescale upon visible excitation. In particular, in D6 , two different CS states can be formed, involving different subunits that decays independently with different lifetimes (ca. 10–100 ps).