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The FT-IR spectra for K_2NbF_7-FLINAK-O~(2-) solution were measured and compared with the spectraof crystalline K_2NbF_7 and K_2NbOF_6.The results show that the niobium fluoro-complex and/oroxyfluoro-complex ions are presented in these solutions.NbF_7~(2-) complex ion is the predominant species inNb(V)-FLINAK solution(not considering oxide impurity).The influence of O~(2-) on the oxyfluoro-complexions shows that NbOF_6~(3-) as a stable monooxyfluoro-complex anion presented in FLINAK-O~(2-) systemsand the number of NbOF_6~(3-) species are increased with increasing of O~(2-) when molar ratio of O~(2-)/Nb(V)is less than 1.
The FT-IR spectra for K_2NbF_7-FLINAK-O ~ (2-) solution were measured and compared with the spectra of crystalline K_2NbF_7 and K_2NbOF_6. The results show that the niobium fluoro-complex and / oroxyfluoro-complex ions are presented in these solutions. The influence of O ~ (2-) on the oxyfluoro-complexions shows that NbOF_6 ~ (3-) as a stable monooxyfluoro-complex anion presented in FLINAK-O ~ (2-) systems and the number of NbOF_6 ~ (3-) species are increased with increasing of O ~ (2-) when molar ratio of O ~ (2-) / Nb V) is less than 1.