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 language | English |
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Pages (from-to) | 735-744 |
Number of pages | 10 |
Journal | Journal of Cluster Science |
Volume | 28 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Mar 2017 |
Keywords
- Hydrothermal reactions
- Polyoxoniobate
- Silicon
- X-ray structure
- PHOTOCATALYTIC PROPERTIES
- COMPLEX
- CLUSTERS
- STRUCTURAL-CHARACTERIZATION
- COORDINATION
- HETEROPOLYNIOBATES
- CATIONS