Insertion of Chromium Oligomeric Species in Hf(HPO4)2·H2O (α-HfP)

The reactions of chromium (III) acetate Cr(OAc) 3 (OAc˭CH 3 OCO) solutions with suspensions of n-propylamine / α-hamium phosphate [Hf(HPO 4 ) 2 ·2C 3 H 7 NH 2 ·H 2 O] (Apr-HfP) have been investigated over a wide range of Cr(OAc) 3 concentrations and heating conditions. The interlayered materials obt...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1998-03, Vol.311 (1), p.263-268
Main Authors: Barcina, Luisa M, Rodríguez, M. Luz, Llavona, Ricardo, Suárez, Marta, Rodríguez, Julio
Format: Article
Language:English
Subjects:
hydrous chromium acetate
pillaring
α-hamium phosphate
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Summary:The reactions of chromium (III) acetate Cr(OAc) 3 (OAc˭CH 3 OCO) solutions with suspensions of n-propylamine / α-hamium phosphate [Hf(HPO 4 ) 2 ·2C 3 H 7 NH 2 ·H 2 O] (Apr-HfP) have been investigated over a wide range of Cr(OAc) 3 concentrations and heating conditions. The interlayered materials obtained have been studied by chemical and thermal analysis, X-ray powder diffraction, electron microscopy and IR spectroscopy; surface areas were also determined. The reaction causes expansion of the interlayer spacing, to a degree depending on the initial chromium content of the solution. The results are interpreted in terms of the formation of hydrous chromium acetate interlayer species which decompose on heating between 350-450°C. The surface area of the α-hamium phosphate increases after the reaction with chromium (III) acetate and in the samples thermally treated.
ISSN:1058-725X
DOI:10.1080/10587259808042396