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For the title compound a phase transition from Phase II to Phase I (low and room temperature phases, respectively) was found at ca. 217 K. The temperature dependence of the  81 Br NQR frequency and that of the dielectric constant showed anomalies at ca. 195 K that were tentatively attributed to a higher order phase transition. A similar anomaly was found at ca. 218 K for 4-chlorobenzyl alcohol which showed a II-I transition at 236 K. The dielectric dispersion observed for both compounds at low temperatures indicates an excitation of a molecular motion with the dielectric relaxation rate of ca. 1 kHz. The temperature dependence of the  81 Br NQR frequencies of 2-and 3-bromobenzyl alcohol, measured at T &gt; 77 K, gave no evidence of phase transition in their crystals.

Phase Transition and Crystal Dynamics of 4-Bromobenzyl Alcohol