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Vanadyl phosphate dihydrate, a solid acid: the role of water in VOPO4·2H2O and its sodium derivatives Na x (VIV x VV 1−x O)PO4·(2−x)H2O

Abstract

Sodium-containing intercalates having as general formula Na x VOPOP4·(2−x)H2O (0.25≤x<0.50) have been obtained and characterized. Orthorhombic phases, which essentially maintain the structure of the layered oxide hydrate VOPO4·2H2O result. Intercalated sodium ions act as ‘pillars’. The presence of H3O+ ions in the parent VOPO4·2H2O and also in some reduced phases, is detected. The understanding of the structural role of the water molecules is advanced and the topotactic dehydration/rehydration processes are studied. The formation of a new metastable VOPO4·H2O phase is established.

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Correspondence to Daniel Beltrán-Porter.

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Casañ, N., Amorós, P., Ibañez, R. et al. Vanadyl phosphate dihydrate, a solid acid: the role of water in VOPO4·2H2O and its sodium derivatives Na x (VIV x VV 1−x O)PO4·(2−x)H2O. Journal of Inclusion Phenomena 6, 193–211 (1988). https://doi.org/10.1007/BF00663052

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Key words

  • Vanadyl phosphate
  • inclusion compounds
  • topotactic reactions
  • solid acids