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Nuclear magnetic resonance of 19 F nuclei in the radical cation salt (pyrene) 12 (SbF 6 ) 7 is analysed in dependence of temperature and frequency. Linewidth and spin-lattice relaxation reflect the rotational motion of the SbF 6 octahedra that is frozen-in on approaching the Peierls transition. The relevance of this mode of molecular motions for the...
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