Molecular Motion in CsH(CHCl₂COO)₂ as Studied by ³⁵Cl Nuclear Quadrupole Resonance and Dielectric Measurements

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³⁵Cl nuclear quadrupole resonance study was carried out on CsH(CHCl₂COO)₂. The Zeeman effect experiment showed that this crystal belongs to a triclinic system with two crystallographically nonequivalent dichloroacetate anions. From the measurement of the temperature dependence of the resonance frequencies and the spin-lattice relaxation times of all the four resonance lines it was found that the CHCl₂ groups in one of the two carboxylate anions undergo internal rotation about C–C bonds below room temperature with the activation energy of 3.97 kcal/mol. Dielectric behavior was consistent with the motion. The nuclear quadrupole resonance frequencies of 17 other chloroacetates are also reported.