Encapsulation of Two Potassium Cations in Preyssler-Type Phosphotungstates: Preparation, Structural Characterization, Thermal Stability, Activity as an Acid Catalyst, and HAADF-STEM Images

Akio Hayashi, Hiromi Ota, Xavier López, Norihito Hiyoshi, Nao Tsunoji, Tsuneji Sano, Masahiro Sadakane

Research output: Contribution to journalArticle

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Abstract

Dipotassium cation (K+)-encapsulated Preyssler-type phosphotungstate, [P5W30O110K2]13-, was prepared by heating monobismuth (Bi3+)-encapsulated Preyssler-type phosphotungstate, [P5W30O110Bi(H2O)]12-, in acetate buffer in the presence of an excess amount of potassium cations. Characterization of the isolated potassium salt, K13[P5W30O110K2] (1a), and its acid form, H13[P5W30O110K2] (1b), by single crystal X-ray structure analysis, 31P and 183W nuclear magnetic resonance (NMR), Fourier transform infrared (FT-IR) spectroscopy, cyclic voltammetry (CV), high-resolution electrospray ionization mass spectroscopy (HR-ESI-MS), and elemental analysis revealed that two potassium cations are encapsulated in the Preyssler-type phosphotungstate molecule with formal D5h symmetry, which is the first example of a Preyssler-type compound with two encapsulated cations. Incorporation of two potassium cations enhances the thermal stability of the potassium salt, and the acid form shows catalytic activity for hydration of ethyl acetate. Packing of the Preyssler-type molecules was observed by high-resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM).

Original languageEnglish
Pages (from-to)11583-11592
Number of pages10
JournalInorganic Chemistry
Volume55
Issue number21
DOIs
Publication statusPublished - Nov 7 2016

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Encapsulation
Cations
potassium
Potassium
Thermodynamic stability
thermal stability
Transmission electron microscopy
catalysts
cations
preparation
transmission electron microscopy
Scanning electron microscopy
acids
Catalysts
scanning electron microscopy
Acids
acetates
Salts
salts
Electrospray ionization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Encapsulation of Two Potassium Cations in Preyssler-Type Phosphotungstates : Preparation, Structural Characterization, Thermal Stability, Activity as an Acid Catalyst, and HAADF-STEM Images. / Hayashi, Akio; Ota, Hiromi; López, Xavier; Hiyoshi, Norihito; Tsunoji, Nao; Sano, Tsuneji; Sadakane, Masahiro.

In: Inorganic Chemistry, Vol. 55, No. 21, 07.11.2016, p. 11583-11592.

Research output: Contribution to journalArticle

Hayashi, Akio ; Ota, Hiromi ; López, Xavier ; Hiyoshi, Norihito ; Tsunoji, Nao ; Sano, Tsuneji ; Sadakane, Masahiro. / Encapsulation of Two Potassium Cations in Preyssler-Type Phosphotungstates : Preparation, Structural Characterization, Thermal Stability, Activity as an Acid Catalyst, and HAADF-STEM Images. In: Inorganic Chemistry. 2016 ; Vol. 55, No. 21. pp. 11583-11592.
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