Attempts failed to produce niobium(V) oxynitrate by the reaction dinitrogen tetroxide and niobium pentachloride in acetonitrile in the formation of the acetonitrile niobium dioxide nitrate complex.[2]
References
^ abcdeB. O. Field; C. J. Hardy (1963). "Trinitratoniobium(V) Oxide, NbO(NO3)3". Proceedings of the Chemical Society: 11. doi:10.1039/PS9630000001.
^K. W. Bagnall; D. Brown; P. J. Jones (1964). "Niobium(V) and tantalum(V) nitrates". Journal of the Chemical Society (451): 2396–2400. doi:10.1039/JR9640002396.