Selective reagents for solvent extraction of metals—I. Quinaldic acids |
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| Authors: | AGSverker Högberg Khorshed Madan Christina Moberg Birger Sjöberg Michael Weber Mamoun Muhammed |
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| Institution: | Royal Institute of Technology, Department of Organic Chemistry, S-100 44 Stockholm, Sweden;Royal Institute of Technology, Department of Inorganic Chemistry, S-100 44 Stockholm, Sweden |
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| Abstract: | Alkyl- and alkoxy-substituted quinoline-2-carboxylic acids were synthesized and tested for metal extraction. Zn2+ and Cu2+ were extracted from aqueous sulphate solutions by reagents containing 8-alkoxy substituents at lower pH values than were Fe2+ or Fe3+. 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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| Keywords: | Authors to whom correspondence should be addressed |
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