A. Meliani et al., Aluminum and titanium imidodiphosphates as single precursor molecules to aluminum and titanium phosphate materials, PHOSPHOR SU, 174, 2001, pp. 133-149
Citations number
35
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
The aluminum and titanium imidodiphosphates compound,, respectively (1) und
er bar and (2) under bar are efficient single-source precursors to homogene
ous aluminum and titanium phosphates materials. The conversion occurs pyrol
ytically at high temperature giving the corresponding compounds. Differenti
al thermal and thermogravimetric analyses, P-31 and Al-27 MAS NMR, as well
as vibrational spectroscopies were used to characterize the final materials
. In the case of the aluminum compound (1) under bar it was found that the
Al-27 MAS NMR signal representative of the octahedral aluminum observed in
the material obtained at 900 degreesC was transformed to a signal character
istic of a tetrahedrally aluminum by increasing the temperature to 1200 deg
reesC, This was confirmed by P-31 MAS NMR and XPS studies. The thermal evol
ution of (2) under bar was studied by using Raman spectroscopy. The convers
ion of the phosphate material to TiO2 in the rutile phase after a thermal t
reatment at 1400 degreesC during 3 hours was observed. The synthetic route
to the phosphate materials described here could represent an alternative wa
y to the sol-gel process and may offer certain advantages.