Molecular motion is solid tropylium salts

Broad line nuclear magnetic resonance studies have been carried out over the temperature range 77 degrees K to 300 degrees K on a representative series of tropylium compounds. The second moments of the line widths indicate that reorientation of the tropylium ions occurs in these solids. Estimates of the activation energies for the reorientation processes have been made from the temperature dependence of the spin-lattice relaxation times.