Allosteric and Chelate Cooperativity in Divalent Crown Ether/Ammonium Complexes with Strong Binding Enhancement

Larissa K. S. von Krbek, Andreas J. Achazi, Marthe Solleder, Marcus Weber, Beate Paulus, and Christoph A. Schalley – 2016

A thorough thermodynamic analysis by isothermal titration calorimetry of allosteric and chelate cooperativity effects in divalent crown ether/ammonium complexes is combined with DFT calculations including implicit solvent on the one hand and large-scale molecular dynamics simulations with explicit solvent molecules on the other. The complexes studied exhibit binding constants up to 2×106 m−1 with large multivalent binding enhancements and thus strong chelate cooperativity effects. Slight structural changes in the spacers, that is, the exchange of two ether oxygen atoms by two isoelectronic methylene groups, cause significantly stronger binding and substantially increased chelate cooperativity. The analysis is complemented by the examination of solvent effects and allosteric cooperativity. Such a detailed understanding of the binding processes will help to efficiently design and construct larger supramolecular architectures with multiple multivalent building blocks.

Titel
Allosteric and Chelate Cooperativity in Divalent Crown Ether/Ammonium Complexes with Strong Binding Enhancement
Verfasser
Larissa K. S. von Krbek, Andreas J. Achazi, Marthe Solleder, Marcus Weber, Beate Paulus, and Christoph A. Schalley
Datum
2016
Kennung
10.1002/chem.201603098
Zitierweise
Chem. Eur. J., 2016, 22, 15475 – 15484
Art
Text
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