0000000000885162
AUTHOR
Stéphane Le Gac
Selective Extraction and Efficient Binding in a Protic Solvent of Contact Ion Triplets by Using a Thiourea-Based Bis-Calix[6]arene Receptor
We report a D3h-symmetric tail-to-tail bis-calix[6]thiourea 5 that displays two divergent cavities triply connected by thiourea linkages. This calix[6]tube was efficiently synthesized through a [1+1] macrocyclization reaction and characterized by X-ray diffraction analysis. The binding properties of this heterotritopic receptor were evaluated in a protic environment (i.e., CD3OD/CDCl3) through NMR studies. Thus, bis-calix[6]thiourea 5 exhibits a remarkable ability in the cooperative complexation of an anion sandwiched between two ammonium ions, a high selectivity for ammonium sulfate salts being observed. The anion is bound through multiple hydrogen-bonding interactions at the thiourea bind…
CCDC 927272: Experimental Crystal Structure Determination
Related Article: Steven Moerkerke, Stéphane Le Gac, Filip Topić, Kari Rissanen and Ivan Jabin|2013|Eur.J.Org.Chem.|2013|5315|doi:10.1002/ejoc.201300639
CCDC 927271: Experimental Crystal Structure Determination
Related Article: Steven Moerkerke, Stéphane Le Gac, Filip Topić, Kari Rissanen and Ivan Jabin|2013|Eur.J.Org.Chem.|2013|5315|doi:10.1002/ejoc.201300639