Kinetic study of niobium and tantalum hexameric forms and their substituted ions by capillary electrophoresis in alkaline medium

Electrophoretic conditions: BGE: 35 mM LiCH3COO·2H2O and 10 mM LiOH·2H2O at a pH of 12.0, short-end injection 0.1 psi during 9.0 s, applied voltage - 22.0 kV, capillary temperature 31.0 °C. Red dots = oxygen. Blue dots = Niobium. Grey dots: Tantalum, with Ta6 and Nb6 being respectively the hexameric polyoxometalates of niobium and tantalum and Ta5Nb1, Ta4Nb2, Ta3Nb3, Ta2Nb4 and Ta5Nb1 the observed substitutions186