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Highly Cooperative Binding of Ion-Pair Dimers and Ion Quartets by a Bis(calix[4]pyrrole) Macrotricyclic Receptor


  • We thank the Spanish Ministerio de Economía y Competitividad (CTQ2011-23014), the Generalitat de Catalunya (2009SGR00686), and the ICIQ Foundation for financial support.


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Connect four: A macrotricyclic receptor equipped with two convergent calix[4]pyrrole units features unprecedented binding properties towards two ion pairs. A highly cooperative binding process is observed for pairs of tetrabutylammonium (TBA) salts. MTOA=methyltrioctylammonium.