1,3-Alternate Calix[4]arene Bifuntional Fluorescent Receptor Containing Urea and Crown Ether Moieties

摘要

Calix[4]arenes are important building blocks in supramole-cular chemistry. The calixarene framework provides a unique possibility to organize several binding sites in an array complementary to a potential guest. A variety of calixarene-based receptors for cations, anions and neutral molecules have been synthesized in the past decade. Though anion recognition appears to be a relatively new area of research, both positively charged and neutral receptors for anionic species have been prepared in the last few years.