19 F n.m.r. studies have shown that NbOF52– is present in solutions of Nbv containing up to 30% HF and that NbF6– is present when the HF concentration is more than 30%. Another ion, probably the NbF72– ion, is present in 95–100% HF solutions.
J. A. S. Howell and K. C. Moss, J. Chem. Soc. A, 1971, 2481 DOI: 10.1039/J19710002481
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