Solid-state {sup 19}F and {sup 13}C NMR of room temperature fluorinated graphite and samples thermally treated under fluorine: Low-field and high-resolution studies

Journal Article · Fri Apr 15 00:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.01.024· OSTI ID:20725898

Giraudet, J ^[1]; Dubois, M ^[2]; Guerin, K ^[2]; Pinheiro, J P ^[2]; Hamwi, A ^[2]; Stone, W E.E. ^[1]; Pirotte, P ^[1]; Masin, F ^[1]

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1. Matiere Condensee et Resonance Magnetique, Universite Libre de Bruxelles, Faculte des Sciences, CP 232, Boulevard du Triomphe, B-1050 (Belgium)
2. Laboratoire des Materiaux Inorganiques, UMR-CNRS 6002-Universite Blaise Pascal, 24 av. des Landais, 63177 Aubiere Cedex (France)

Room temperature graphite fluorides consisting of raw material and samples post-treated in pure fluorine atmosphere in the temperature range 100-500 deg. C have been studied by solid-state NMR. Several NMR approaches have been used, both high and low-field {sup 19}F, {sup 19}F MAS and {sup 13}C MAS with {sup 19}F to {sup 13}C cross polarization. The modifications, in the graphitic lattice, of the catalytic iodine fluorides products have been examined. A transformation of the C-F bond character from semi-ionic to covalent has been found to occur at a post-treatment temperature close to 400 deg. C. It is shown that covalency increases with temperature.

• OSTI ID: 20725898
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CHEMICAL BONDS
COVALENCE
FLUORINE
GRAPHITE
IODINE FLUORIDES
NUCLEAR MAGNETIC RESONANCE
POLARIZATION
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K