Bridge over troubled water: Highly fluorescent thiazolothiazole dyes with quantum yields of up to 60 % were prepared in a facile synthesis from dithiooxamide and various aldehydes. When adequately engineered, such dyes could be used as fluorescent bridges with other dyes. A sequence of highly efficient, intramolecular electronic-energy-transfer steps followed from selective illumination of the fluorescent centre in the molecular triads.
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