Collect. Czech. Chem. Commun.
1980, 45, 3302-3312
https://doi.org/10.1135/cccc19803302
Reactions of gallocyanine methyl ester with vanadates and molybdates
Milan Kotouček, Marie Barešová and Nguyen Truong Son
Department of Analytical and Organic Chemistry, Palacký University, 771 46 Olomouc
Abstract
Reactions of gallocyanine methyl ester with vanadates and molybdates were examined spectrophotometrically in weakly acidic solutions in 10% (m/m) ethanol. Vanadates form the VO2L2, VO2(OH)L, and VO3L complexes at pH 3-6.5, molybdates form the MoO2L2 and MoO3L complexes at pH 1.5-4.4 and pH 3-5.3, respectively. The equilibrium constants of the systems concerned were calculated from the data of the concentration curves. Use has been made of the formation of the MoO2L2 complex for photometric determination of molybdenum.
