Benzobisthiadiazole Building Block Useful for the Development of Near-Infrared (NIR) Dyes

4,8-Dibromobenzo[1,2-c:4,5-c']bis[[1,2,5]thiadiazole] (1) is an acceptor building block useful in the development of functional dyes^1–3) and π-conjugated polymers,^4,5) due to its strong electron-withdrawing property and a proquinoid structure.⁶⁾ Its ability to enable long-wavelength absorption and/or emission makes 1 valuable for developing dyes used in fluorescence imaging,¹⁾ photothermal therapy (PTT),²⁾ and sonodynamic therapy (SDT),³⁾ particularly those operating in the second near-infrared (NIR-II) region, which minimizes tissue scattering and autofluorescence. Additionally, 1 facilitates the development of π-conjugated polymers for high-mobility organic thin-film transistor (OTFT) materials⁴⁾ and thermoelectric materials.⁵⁾

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