Surprising characteristics of D–A-type functional dyes by introducing 4-alkoxythiazoles as the donor-unit

In this study, we report on the syntheses of novel donor–acceptor molecules. These new dyes comprised benzo[c][1,2,5]thiadiazole and pendants with one or two 4-alkoxythiazoles as donor parts, which were introduced without Pd-catalyzed cross coupling reactions. The optical and electrochemical properties were studied via absorption, emission spectroscopy and cyclovoltammetric measurements. We experimentally found surprising small band gaps from HOMO to LUMO of 2.4 eV and 2 eV, respectively, which were also investigated using DFT calculations.
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