Macrocyclic compound, its chemistry and partitioning application

Basic studies on design and synthesis of macrocyclic compounds and their fundamental extractability for partitioning have been investigated, since macrocyclic compounds indicated an interesting peculiarity such as significant selectivity based on the size fit by their cavity and ionic diameter of guest cation. Novel polyether bis (β-diketone) complexes and crownophane compounds, calixarene analogs have been synthesized as new ligands. Among the various macrocycles, crownophane compounds substituted by pyridyl groups gave high extractability for Ag with its distribution ratio 20-30. Bis (β-diketone)-transition metal (such as Cu, Ni, Zn) complexes showed various selectivity for the guest alkaline, alkaline earth and lanthanide elements. In the neutral aqueous condition, bis (β-diketone)-Cu complex showed higher selectivity for Sr than that of the other ligands including dibenzo-18-crown-6. Extractability and selectivity of ordinary macrocyclic compounds are also investigated through the fundamental extraction tests in PNC. As a result of these tests, dicyclohexano-18-crown-6 was confirmed to extract Sr selectively from simulated high acidic HAW solution. (author)