Behavior of MnIV in the hexaniobate, telluropentaniobate and hexatantalate solutions

Pavel A. Abramov, Maria M. Akhmetova, Tamara E. Romanova, Artem S. Bogomyakov, Matvey V. Fedin, Maxim N. Sokolov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Reactions of K7H[Nb6O19], K6[(OH)TeNb5O18] or Na8[Ta6O19] with Mn(OAc)2 in the presence of H2O2 lead to the formation of brown solutions. In the case of the hexaniobate crystallization gives orange crystals of K9Na2[HMn(Nb6O19)2]·18·5H2O (1), characterized by XRD, XRPD and EPR. Magnetic properties and stability of 1 in aqueous solution have been studied. The rate of formation of the telluropentaniobate analogue, [Mn(TeNb5O19)2]10−, is much more slow. It is relatively stable in solution, though less so than the hexaniobate complex, and could not be isolated. In the case of hexatantalate the reaction solution is unstable and transforms into an intractable brownish amorphous precipitate. EPR studies of the solids isolated from the reactions with [(OH)TeNb5O18]6− and [Ta6O19]8− suggest oligomeric or polymeric nature of the solids, with the formation of {MnIV xOy} aggregates.

Original languageEnglish
Pages (from-to)268-274
Number of pages7
JournalInorganica Chimica Acta
Volume473
DOIs
Publication statusPublished - 24 Mar 2018

Keywords

  • CRYSTAL-STRUCTURE
  • ANION
  • POLYOXONIOBATES
  • MANGANESE(4)
  • NIOBATES

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