Graphite fluorides: An XPS study of a new type of C-F bonding

Autor:	H. Estrade-Szwarckopf, Bernard Rousseau, I. Palchan, M. Crespin
Rok vydání:	1989
Předmět:	Inorganic chemistry Intercalation (chemistry) Binding energy General Physics and Astronomy chemistry.chemical_element Crystallography Highly oriented pyrolytic graphite X-ray photoelectron spectroscopy chemistry Covalent bond Fluorine Graphite Physical and Theoretical Chemistry Stoichiometry
Zdroj:	Chemical Physics Letters. 157:321-327
ISSN:	0009-2614
DOI:	10.1016/0009-2614(89)87255-0
Popis:	Highly oriented pyrolytic graphite was fluorinated at room temperature with molecular fluorine at 2.5 atm for 8 days to 2 months without addition of any catalyst. Under these mild conditions we obtained graphite-fluorine intercalation compounds in a wide range of stoichiometry 64 ⩾ C/F ⩾ 4. Except for the highest fluorine content (C/F ⩽ 4) all our samples are better conductors than graphite. A thorough XPS study of clean cleaved internal surfaces of the oriented samples shows a new kind of carbon-fluorine bonding. The binding energies of the C 1s and F 1s photoemission peaks are 287.3 ± 0.2 and 685.7 ± 0.2 eV. These values differ from those of typical covalent bonds (290.4 and 689.6 eV) and the nature of the bond is probably different from that of covalent CF.
Databáze:	OpenAIRE
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