Abstract
Proton magnetic resonance data in polycrystalline (2,4,5-trichlorophenoxy)acetic acid in the temperature range 77-400 K are reported in this communication. After a correction is made for the H-H distance in the methylene group the rigid lattice second moment (S2) coincides with the experimental value in the temperature range 77-170 K. The observed fall in S2 in the temperature range 170- 208 K is interpreted as the result of the CH2COOH group reorientation. The barrier height associated with the reorientation is found to be 8.728 kJ mol- which indicates non-cleavage of hydrogen-bonding in the dimeric unit during reorientation.
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