Abstract
A series of A-π-D-π-A type symmetrical push-pull chromophores with various end groups (e.g., trifluoroacetone, indanone, dicyano, isoxazolone and pyrazolinone) linked through a symmetric π-conjugated backbone (EDOT-phenylene vinylene-EDOT) was synthesized. The effect of end group tuning on optical properties was intensively investigated by UV–visible absorption, fluorescence spectroscopy and DFT calculations. A broad range of chromophores showing strong absorption was achieved with a fine alteration of the electron-accepting strength of the terminal acceptors. The optical investigation demonstrated that their low optical band gap (1.8–2.2 eV) combined with outstanding molar absorptivity (45,000–101,500 M−1 cm−1) which would provide strong light-capturing capability.
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