Formation of Silicon-Containing Polyoxoniobates from Hexaniobate Under High Temperature Conditions

P. A. Abramov, A. T. Davletgildeeva, M. N. Sokolov

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Hydrothermal reaction of K7H[Nb6O19]·13H2O with Na2SiO3·9H2O (220 °C, 24 h) produces a lacunary siliconiobate [Si4Nb16O56]16−, which was isolated as mixed salt NaK8H6[Na@Si4Nb16O56]·26H2O (1). Changing the silicon source to Ph2Si(OH)2 under the same conditions slightly improves the yield of [Si4Nb16O56]16−, which was isolated as K14H[K@Si4Nb16O56]·26H2O (2). Extending the reaction time leads to rearrangement of [Si4Nb16O56]16− into Keggin-type silicododecaniobate [SiNb12O40]16−, which was isolated and characterized as K8H2(Nb2O2)[SiNb12O40]·20H2O (3). The complexes were characterized by X-ray single crystal analysis, elemental analysis, thermogravimetry, 29Si NMR.

Original languageEnglish
Pages (from-to)735-744
Number of pages10
JournalJournal of Cluster Science
Volume28
Issue number2
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Hydrothermal reactions
  • Polyoxoniobate
  • Silicon
  • X-ray structure
  • PHOTOCATALYTIC PROPERTIES
  • COMPLEX
  • CLUSTERS
  • STRUCTURAL-CHARACTERIZATION
  • COORDINATION
  • HETEROPOLYNIOBATES
  • CATIONS

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