Journal
JOURNAL OF STRUCTURAL CHEMISTRY
Volume 50, Issue 4, Pages 618-627Publisher
PLEIADES PUBLISHING INC
DOI: 10.1007/s10947-009-0097-9
Keywords
heteropoly acids; titanium complexes; NMR
Funding
- RFBR [04-03-32113]
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Heteropoly acid (HPA) H-8(PW11TiO39)(2)O center dot xH(2)O (I) is synthesized by three different ways and studied by chemical analysis, potentiometric titration, mass-spectrometry, IR, P-31, W-183, and O-17 NMR spectroscopy, thermogravimetry, and transmission electron microscopy. Anion I consists of two subparticles of the Keggin structure bridged by Ti-O-Ti. The dimeric anion exists in HPA aqueous solutions at [I] > 0.02 M. At pH > 0.6 it splits to a [PW11TiO40](5-) monomer stable up to pH similar to 6. When heated (150-400)A degrees C, I splits into H3PW12O40 and, apparently, H3PW10Ti2O38 without phase separation. Thermolysis products are soluble and when dissolved in water turn again into I. Complete decomposition of I to oxides occurs at similar to 450A degrees C.
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