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along with strontium-90. Much effort has been made to the development of improved processes 3,4 for the removal of cesium-137 from nuclear wastes. For the efficient removal of cesium, several crown ethers have been prepared and their binding properties were investigated. For the development of a selective ligand for cesium ion, calix[6]arenes have been utilized as a receptor. When six ester groups were introduced at the lower rim, a high binding property for cesium ion was reported. 5 But selectivity over potassium and rubidium is not quite high. The lack of selectivity has been attributed into the flexibility of the parent calix[6]arene moieties. The most effective approach to make them immobile is to build a bridge at the lower. Since Gutscheís lower rim-bridged calix[6]arene in 1993, several lower rim-multibridged calix[6]arenes and their ion binding properties were reported. 7-9

Highly Cesium Selective Calix[6]arene Receptors: Synthesis, Structure and Cesium Binding Properties of Calix[6]arene Biscrown