Abstract
Alkyl- and alkoxy-substituted quinoline-2-carboxylic acids were synthesized and tested for metal extraction. Zn 2+ and Cu 2+ were extracted from aqueous sulphate solutions by reagents containing 8-alkoxy substituents at lower pH values than were Fe 2+ or Fe 3+. Reagents without this substituent were unselective in this respect. A possible explanation for the selectivity may be that the 8-substituent influences the coordination geometry of the metal chelates in favour of tetrahedral complexes.
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