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The sugar/ BODIPY conjugates 40 and 41 respond to both cations (Cu2+ and Fe3+) and anions (F− and CN−), which quench the BODIPY emission at 515 nm. These anions are thought to strip BF2 from the BODIPY unit, while Cu2+ (triazole) and Fe3+ (carbonyls) coordinate to the macrocycle and quench emission by other means [117].
