Niobium uptake by {P2W12} polyoxoanion with [NbO(C2O4)2(H2O)2] as Nb source

Alexandra A. Shmakova, Taisiya S. Sukhikh, Victoria V. Volchek, Vadim Yanshole, Dmitri V. Stass, Eugeniy Yu Filatov, Eugeniy M. Glebov, Pavel A. Abramov, Maxim N. Sokolov

Research output: Contribution to journalArticlepeer-review

Abstract

Reaction of (NH4)[NbO(C2O4)2(H2O)2]·3H2O with K12[H2P2W12O48]∙24H2O in aqueous solution at pH 1.7 leads to the formation of mixed Nb/W species based on [(P2M18O60)2(µ-O)2]n− (M is a Nb/W mixture, when Nb ratio ranges from 6 to 8 and charge differs from 14- to 16- correspondingly) archetype. Direct crystallization from the reaction media results in colorless crystals with the composition formulated as K9(NH4)5[cis-(P2W15Nb3O61)2]·48H2O (1). Crystallization in the presence of (NMe2H2)Cl yields two phases (2a and 2b), containing the same [trans-(P2W14.7Nb3.3O61)2]14.6− anions but different cation/H2O compositions. Both phases are present in a mixture with bulk composition corresponding to (NMe2H2)14.6[P2W14.7Nb3.3O61]2·28H2O (2). The solution behavior of 1 and 2 was studied with HR-ESI-MS and HPLC-ICP-AES. During XRPD study of 2 we found blue coloration of the thin film of the complex. This effect has only surface nature and was studied by diffuse reflectance spectra.

Original languageEnglish
Article number119319
Number of pages6
JournalInorganica Chimica Acta
Volume502
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • CLUSTER
  • ICP-AES TECHNIQUE
  • POLYOXOMETALATE
  • SPECTROMETRY
  • STABILITY

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