Abstract
Proton magnetic resonance studies have been carried out on a polycrystalline sample of parachlorophenoxy acetic acid in the temperature range 77 to 400K. The experimental second moment (11.5 G2) agrees within the experimental error with the value calculated using the available crystal structure data, indicating that the lattice is rigid below 112K. Second moment fall, which is observed in the temperature range 112-125K, is attributed to the rapid reorientation of the CH2COOH group. This reorientation is associated with an activation energy of 7.90 kcal mol-1, which indicates that the intramolecular reorientation breaks the strong hydrogen bonds in the dimeric unit.
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