Supramolecular chemistry;
Salt receptor;
Recognition in water;
Binding cooperation;
RECEPTOR CHEMISTRY HIGHLIGHTS;
HETERODITOPIC SALT RECEPTOR;
SELECTIVITY;
ROTAXANE;
CATIONS;
HALIDE;
WATER;
D O I:
10.1016/j.tet.2017.10.077
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
An L-arginine based compound was designed and prepared as a heteroditopic ion-pair receptor. The cation binding is provided by a sodium selective N-acyl-aza-18-crown-6 subunit whereas for anion complexation, urea and guanidinium groups were introduced. As shown by H-1 NMR titrations this receptor is capable of binding sodium halide ion-pairs in solutions containing up to 20% of water. The halide binding is stronger in the presence of co-coordinated sodium cation than in the presence of non coordinated TBA cation. (C) 2017 Elsevier Ltd. All rights reserved.