Use of 19F nuclear magnetic resonance spectroscopy for probing substitution of Al for Ga in cloverite

✍ Scribed by C. Schott-Darie; L. Delmotte; H. Kessler; E. Benazzi

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 468 KB
• Volume: 3
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/0926-2040(94)90051-5

✦ Synopsis

The synthesis of gallophosphate cloverite in the presence of aluminum leads to a partial substitution of Ga by Al. *'Al and 19F magic-angle spinning nuclear magnetic resonance (MAS NMR) studies on this material confirm this substitution. "Al MA.5 NMR shows a broad line at 30 ppm which can be attributed to tetrahedrally coordinated Al in the solid. The 19F MAS NMR results are more complex. The spectrum presents five lines between -68 ppm and -95 ppm which can be assigned to fluorine in D4Rs with variable composition in Ga and Al. Two other lines, at -145.6 ppm and -178.2 ppm, may correspond to impurities and to a fluorine atom in a pseudo-sodalite cage environment, respectively.