Abstract
Abstract Various covalent graphite fluorides were studied using solid state nuclear magnetic resonance (NMR). 19 F magic angle spinning (MAS) NMR, 13 C MAS NMR and 13 C MAS NMR with 19 F to 13 C Cross Polarization (CP) allow both the presence of CF and CF 2 groups and the carbon atoms hybridization, sp 2 or sp 3 , to be determined. 19 F spin–lattice relaxation time T 1 of the 19 F line is presented. The effects of paramagnetic centers on the relaxation were evaluated. Paramagnetic oxygen is shown to be an important source of relaxation. The presence of a molecular motion with an activation energy of 1.685 kJ mol −1 is also evidenced for one of the (CF) n sample.
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