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The sulfate anion SO42– – one of the most powerful and versatile anionic templates – can be reversibly “switched off” in aprotic solvents by protonation to the very weakly binding anion HSO4–. This sharp ON/OFF behaviour opens new opportunities for switching and manipulation of anion templated supramolecular systems, such as reversible folding/unfolding, assembly/disassembly or induction of mechanical...
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