Abstract
We have achieved the first series of DAAQ-based building blocks, viz., n-TIPS-DAAQs (n = 1–4), and unraveled a rational design of their π-extension. Sequentially increasing numbers (n) of the exocyclic π-linkers showed (a) a systematic bathochromic shift in both absorption and emission spectra, (b) selective stabilization of the lowest-unoccupied molecular orbital (LUMO), and (c) unselective changes in the S0/S1 states. To our surprise, the LUMO level of 4-TIPS-DAAQ (−3.72 eV) was found to be comparable to that of PC60BM.
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