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Keywords = poly(tetracarbon monoflouride)

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21 pages, 5586 KiB  
Article
Composites of (C4F)n and (CF)n Synthesized by Uncatalyzed Fluorination of Graphite
by Brennan J. Walder, Noah B. Schorr, Lyle B. Brunke, Michael P. Siegal, Todd M. Alam, Keith J. Fritzsching and Timothy N. Lambert
Solids 2022, 3(2), 237-257; https://doi.org/10.3390/solids3020017 - 29 Apr 2022
Cited by 4 | Viewed by 3528
Abstract
A new solid-state 19F magic-angle spinning NMR signal at an isotropic 19F chemical shift of −53 ppm is measured from graphite fluoride synthesized by reaction of graphite with F2 at temperatures above 750 K with no catalyst. Two-dimensional NMR suggests [...] Read more.
A new solid-state 19F magic-angle spinning NMR signal at an isotropic 19F chemical shift of −53 ppm is measured from graphite fluoride synthesized by reaction of graphite with F2 at temperatures above 750 K with no catalyst. Two-dimensional NMR suggests the −53 ppm 19F NMR signal originates from covalent fluoromethanetriyl groups belonging to ordered (CyF)n bulk domains composited with the major (CF)n domains. Quantitative 19F and 13C NMR find y=4.32±0.64. DFT calculations of NMR chemical shifts for unsaturated fluorographene models show that a (C4F)n phase with fluorine bound covalently to a single side of the carbon layer best explains the observed NMR chemical shifts. We assign the new phase to this (C4F)n structure, which constitutes up to 15% of the carbon in our graphite fluoride composites. The (C4F)n content of the composite affects bulk electrochemical properties in a manner similar to graphite fluorides produced by conventional, catalyzed fluorination processes. Full article
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