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Steffen Bähring, Gunnar Olsen, Prof. Dr. Paul C. Stein, Prof. Dr. Jacob Kongsted and Prof. Dr. Kent A. Nielsen Coordination-Driven Switching of a Preorganized and Cooperative Calix[4]pyrrole Receptor Chemistry - A European Journal 19

Version of Record online: 7 JAN 2013 | DOI: 10.1002/chem.201203319

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Zinc's a turn on! The molecular recognition of an asymmetric tetrathiafulvalene (TTF)–calix[4]pyrrole receptor can be reversibly switched between positive and negative cooperativity, when binding 1,3,5-trinitrobenzene (TNB), by chemical stimuli in the form of ZnII (see figure). An intramolecular complexation promotes a preorganized receptor with an increased affinity for TNB with a 237-fold increase in the first complexation (K1).

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