A quinoxaline-fused octaphyrin(2.0.0.0.2.0.0.0) was synthesized by the FeCl-induced oxidative coupling of an α-free quinoxaline-fused tetrapyrrole. This macrocycle adopts a figure-of-eight conformation in the solid state and acts as a rudimentary chemosensor in solution. The Lewis basic anions fluoride and hydroxide induce a colour change a deprotonation mechanism.
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