Abstract
Abstract A reduction of the anisotropic hyperfine interaction of dopant transition metal complexes due to motional averaging is observed during order-disorder phase transitions in molecular solids. The onset of the reduction of the hyperfine splitting of copper benzoyl acetonate doped into hexamethyl benzene and cyclohexane corresponds to temperatures at which other data show evidence for order-disorder phase transitions. It is shown that this effect can be used to study the dynamics of the disordering. The approach is used to present evidence for the existence of new order-disorder phase transitions above room temperature in ammonium dihydrogen phosphate and potassium dihydrogen phosphate. Evidence for molecular tumbling is also found in the solid state of the liquid crystal material p-methoxy cinnamic acid.
Published Version
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