Collect. Czech. Chem. Commun.
1982, 47, 1950-1963
https://doi.org/10.1135/cccc19821950
Reactions of gallocyanine methyl ester with gallium(III) and indium(III) ions
Milan Kotouček, Josef Růžička and Pavla Vaculíková
Department of Analytical and Organic Chemistry, Palacký University, 771 46 Olomouc
Abstract
Reactions of gallocyanine methyl ester with gallium(III) and indium(III) ions in solutions in 15% (m/m) ethanol were studied spectrophotometrically. At pH 1.7-6.5, the GaL, GaL2, and Ga(OH)L3 complexes are formed; in the case of indium, the In(OH)2L2 and In(OH)L3 complexes appear at pH 4-6.5, and InL3B2 in tartrate solutions. The conditional stability constants and the equilibrium constants of the coordination equilibria were calculated, and procedures were worked out for a photometric determination of gallium and for a chelatometric determination of gallium and indium using gallocyanine methyl ester as metallochromic indicator.
