Solvent Extraction of Potassium by Nitrobenzene Solution of Sodium Dicarbollylcobaltate in the Presence of p-tert-Butylcalix[4]arene-tetr akis(N,N-diethylacetamide)

摘要

Calixarenes are macrocyclic compounds which are not only easily available on a large scale,but also offer nearly boundless possibilities for chemical modification[1].This makes them highly attractive as building blocks for more sophisticated and elaborate host molecules.Among the numerous'tailor made'ligands for a large variety of metal cations,crown ether derivatives of calixarenes(calixcrowns)represent not only some of the earliest complexes[2],but also elegantly demonstrate the potential of these compounds[3].Calixarenes find applications as selective binders and carriers,as analytical sensors,as catalysts and model structures for biomimetic studies[4].