THE SYNTHESIS OF [(C4H9)4N]NK7-NNBW11O40H2 COMPLEX (N=5, 6)

The anion of 11-tungstoniobate was synthesized for the first time as [(C4H9)4N]n K7-nNbW11O40H2 (n = 5, 6) by the reaction of soluble potassium naiobate and powdery white tungstic acid in aqueous solution. The structure of the anion may be proposed reasonably to be similar to that of dodecameric anion of metatungstate, resulting from substituting of one WO6 group in metatungstate anion by me NbO6 group and leading to the formation of 11-tungstoniobate anion according to the extreme similarity of IR and Raman spectra of these two different anions.