Kunihiro Watanabe, M. Hojjatie, T. Shima
Apr 1, 1989
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Journal
Analytical Sciences
Abstract
proton affinity are appropriate auxiliary ligands. Trioctylphosphine oxide (TOPO) is a monodentate phosphine oxide ligand the basicity at which is sufficiently strong to form stable adducts with metal chelates."2 Extraction and/ or separation results for magnesium3 and aluminum4 have been reported for dihydroxyazobenzene. 2,2'-Dihydroxyazobenzene (DAB) reacts with aluminum(III), gallium(III), indium(III) and magnesium(II) to form stable fluorescent complexes in a mixture of aqueous and polar aprotic solvents.5 This reagent is specific for magnesium(II) without interference from calcium(II).3 A derivative of this ligand, 2,2'-dihydroxy-4,4'-dimethylazobenzene (DDAB), is more sensitive than the parent ligand. Although both ligands are very useful fluorometric reagents, the limited extraction data indicate a need for a broader investigation regarding the extraction behavior and coordination chemistry of these ligands, alone or combined with synergists. We report here on the extraction and fluorometric determination of gallium(III) ions with DDAB and TOPO in hexane.