[摘要]：New calix[4]pyrroles bearing dipyrrolylquinoxaline as strapping elements were synthesized and characterized by spectroscopic means. The binding behavior of these receptors at 25?was studied 1st by 1H NMR spectroscopy in CD3CN/DMSO-d6 (9:1 vol./vol.), as well as by UV-visible spectroscopy and isothermal titrn. calorimetry (ITC) in CH3CN/DMSO (97:3 vol./vol.). The receptors displayed a selective colorimetric response when exposed to the fluoride, dihydrogen phosphate, and acetate anions (studied as the corresponding tetrabutylammonium salts) and an enhanced affinity as compared to a comparable calix[4]pyrrole system lacking the dipyrrolylquinoxaline-contg. strap.
