Abstract
3-(4-Antipyrinylazo)-2,4-pentanedione (azonol A) forms brick-red and wine-red complexes with Co(II), Pd(II), Ni, Fe(II), Cu(II), Zn, Cd, Hg(II), Pb(II), Mn(II), Sc, Y, lanthanons, Zr, Hf, Th and Bi, in the pH range of 1.00–10.00. The complexes usually have a metal : ligand ratio of 1 : 2, except for the thorium and bismuth complexes which are 1 : 3. Complexation with cobalt(II) at pH 1.10 in the presence of EDTA allows a selective determination of cobalt; of 25 cations studied, only 4-fold molar ratios of vanadium(V), 6-fold molar ratios of palladium(II), copper(II) and scandium and 8-fold molar ratios of zinc and iron (II) caused interference in the determination of 0.5 gmole of cobalt(II). Amongst 15 anions, 20-fold molar ratios of oxalate and 30-fold molar ratios of cyanide caused low results. Scandium can be determined at pH 1.10 in presence of cyanide; only bismuth, thorium, hafnium and iron(III) interfere seriously.
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