Закономерности образования комплексов кобальта (II)

Abstract

Потенциометрическим методом изучено комплексообразование Со(II) с цитратом натрия, дифосфатом калия, динатриевой солью этилендиаминтетрауксусной кислоты (Na2H2Y). Установлен состав монолигандных комплексов кобальта (II) при различных соотношениях концентраций комплексообразователя и лигандов. Рассчитаны значения констант нестойкости комплексов. Показана перспективность их использования при разработке электролитов для нанесения покрытий кобальтом, а также бинарными и тернарными сплавами кобальта с тугоплавкими металлами.In this work method potentiometrically was studied complexation Co (II) with sodium citrate, potassium diphosphate, disodium salt of thylenediaminetetraacetic acid (Na2H2Y). The composition monoligand complexes of cobalt (II) at different values and concentrations of complexing ligands was defined. According to the analysis of experimental data, it was found that in systems, Со2+ – C3H5O(COO)3 3−, Со2+ – H2Y2− with increasing concentration of the ligand complexes have a constant composition, and Со2+ – P2O7 4− tend to change the composition of the complex. The calculated values of the instability constants of complexes create the preconditions for the development of electrolytes for galvanic deposition cobalt coatings, as well as binary and ternary alloys, cobalt with refractory metals, which have higher physical and chemical charactertics , compared with the individual metals. The spent methodology for conducting experiments in the future, is applicable for the determination of mixed complexes cobalt, as well as mono and poliligand complexes of tungsten and molybdenum.