Abstract
The equilibrium acquisition times in chromium(III)‒organic ligand systems were determined under various conditions. Chromium(III) compounds with picolinic acid Cr(C6H4NO2)3 ⋅ H2O, nicotinic acid CrOH(C6H4NO2)2 ⋅ 2H2O, and citric acid CrC6H5O7 ⋅ 3H2O were isolated; their gravimetric and thermogravimetric analyses carried out; and IR spectra measured. The major chromium(III) complex species with the above-listed acid anions in solutions were found to have a (1 : 1) stoichiometry using isomolar series; their stability constants were determined by potentiometric measurements. The electronic absorption spectra of the systems were analyzed. The photometric determination of chromium picolinate in solutions was developed, the solubility constant KS was determined (log KS = –21.52 ± 0.29), quantum-chemical calculations carried out for a gaseous molecule, and energy and geometric parameters calculated.
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