Liquid-liquid extraction of iron(III) and gallium(III) with macrocyclic Schiff bases containing bisphenol A subunits

✍ Scribed by Shigeki Abe; Jiroh Mochizuki; Tyo Sone

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 437 KB
• Volume: 319
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(95)00496-3

✦ Synopsis

Tbe quantitative extraction of iron(II1) and gallium(II1) was investigated with the recently synthesized macrocyclic Schiff base containing bisphenol A subunits. The phenol groups in the Schiff base moiety led to a large increase in the percent extraction of trivalent metal ions. The substitution of methoxy groups for phenolic OH ligands resulted in a marked decrease in the extractability of metal ions, and no iron(II1) was extracted. The corresponding acyclic Schiff base was found to have a reasonable reactivity toward metal ions and a better solubility in organic solvents. The iron(II1) and gallium(II1) complexes with macrocyclic and acyclic Schiff bases were quantitatively extracted into nitrobenzene without the presence of bulky counter anions. A single extraction gave a good separation of iron(II1) from iron(U) in the mole ratios 4:l to 1:3. The red iron(III) complexes can be used for the extraction-spectrophotometric determination of iron(III). The apparent molar absorptivity at 518 nm is 5.43 X lo3 1 mol-' cm-'.