Abstract
The liquid-liquid extraction of various metal ions by a couple new calix [4] arenes, which have aminobenzene carboxylic acid, benzothiazole, and benzoxazole, thiomethyl, and pyrazple group the upper rim of calix. These ligands ofextraction ability for metal cations including alkali and transition metal onesusing picrate counter ion have been examined. Benzothiazole and benzoxazolemodified calix [4] arene derivatives (4 and 5 respectively) were converted tothe phenol derivatives using BBr3. The benzothiazole phenol derivative (6) shows high selective extraction ability for Cu2+ and Hg+, but the benzoxazolederivative (7) does show extractability for only Hg+. On the other hand, themethoxy calix [4] arene derivatives except thiomethyl appended derivative (8) show higher metal binding ability in this system.
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