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35 Cl NQR frequencies and spin-lattice relaxation times T 1Q  were measured in p-ClC 6 H 4 CO 2 H(PCB A) and p-ClC 6 H 4 CO 2 D(PCBA-d 1 ) at 77-333 K. T 1Q  in PCB A gave a shallow minimum of 8.0 ms at ca. 110 K, which could be explained by a double proton transfer mechanism in the carboxylic acid dimer referring to  1 H NMR data giving a T 1H  minimum at almost the same temperature. PCBA-d 1 , showed temperature dependent NQR frequencies quite analogous to those in PCBA, whereas their T 1Q  behaviour was quite different in its minimum value and its temperature as well as temperature gradient. These results were explained by suppressed deuteron tunnelling and the Ubbelohde effect.

35 Cl NQR Studies of Hydrogen Transfer in Crystalline p-Chlorobenzoic Acid