Structures of Bismuth(III) Complexonates in Aqueous Solutions Studied by 1H NMR Method

Aqueous solutions of bismuth(III) nitrilotriacetates BiNta · 2H2O and M3Bi(Nta)2 ·nH2O (M = Na, K, Rb, Cs, NH4, CN3H6, n = 0−4) and the K[Bi(Edta)(Tu)2] complex (Edta4− is the anion of ethylenediaminetetraacetic acid, Tu is thiocarbamide) are studied by the 1H NMR method at room temperature in the pH interval from 2 to 11. The formation of two types of bismuth nitrilotriacetate complexes in solutions is established. They are characterized by the presence (type 1) or absence (type 2) of the Bi–N bond. Their ratio, depending on the composition and pH of the solution, is determined. The K[Bi(Edta)(Tu)2] compound in solutions occurs as one form. The pH values at which the substance begins to decompose are determined for each compound.