Use of 19F nuclear magnetic resonance spectroscopy for probing substitution of Al for Ga in cloverite.
The synthesis of gallophosphate cloverite in the presence of aluminium leads to a partial substitution of Ga by Al. 27Al and 19F magic-angle spinning nuclear magnetic resonance (MAS NMR) studies on this material confirm this substitution. 27Al MAS 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.
Schott-Darie
C
C
Laboratoire de Matériaux Minéraux, URA-CNRS 428, Ecole Nationale Supérieure de Chimie, Mulhouse, France.
Delmotte
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L
Kessler
H
H
Benazzi
E
E
D017607:Aluminum Compounds / Q000737:chemistry*; D005461:Fluorine; D005708:Gallium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010710:Phosphates / Q000737:chemistry*
D017607:Aluminum Compounds; D010710:Phosphates; D005461:Fluorine; D005708:Gallium; C012714:aluminum phosphate