On the nature and structure of ‘niobic acid’ and its pyrolytic products: 1H NMR,I.R., conductivity and Ion exchange studies |
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Authors: | B.K. Sen A.V. Saha N. Chatterjee |
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Affiliation: | Department of Chemistry, University College of Science Calcutta 700 009 India;Saha Institute of Nuclear Physics, Calcutta, India |
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Abstract: | Niobic acid of composition H8Nb6O19 has been prepared by thorough drying of the hydrated oxide at 150°C. The mass was heated in stages up to 1200°C and the intermediate products were subjected to 1H NMR measurements for determining their proton content. Infra red spectra indicate the presence of protons which are highly delocalised among different oxygen sites. The electrical conductivity of niobic acid has been interpreted as due to proton-hopping. The ion exchange capacity of the material has also been studied. The data have been used to formulate the structure of niobic acid and to obtain the correct procedure for the gravimetric determination of niobium as oxide. |
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