Abstract
Abstract The effect of the organic Lewis bases acting as a synergist on the extraction of zinc(II) and cobalt(II) with benzoyltrifluoroacetone was studied. n-Hexyl alcohol, TBP TBPO and TOPO were used as oxygen-containing bases, and quinoline, isoquinoline, lepidine, acridine and quinaldine as nitrogen-containing bases. The stability constants between metal chelates and the adduct forming materials in the organic phase were obtained by curve fitting method. The results are summarized as follows: (1) Zinc(II) and cobalt(II) chelates formed adducts including one or two molecules of the bases per metal ion. Adduct formation was carried out successively. (2) The stability of adducts with oxygen-containing organic bases increased in the order, n-hexyl alcohol<TBP<TBPO≈TOPO. This is the same order with that of the basicity of donor oxygen in the compounds. The stability of adducts with nitrogen-containing bases increased in the order, quinaldine<acridine<quinoline<lepidine<isoquinoline. In this case, however, the steric effect of the bases preferably contributed to the adduct formation. (3) The overall stability constants of the adducts are affected by the coordination number of the metal ions. Cobalt(II) adducts are more stable than zinc(II) adducts.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
