Phase-Change in 1,2,4,5-Tetrabromobenzene investigated by Pure Quadrupole Resonance


IT is the purpose of this communication to mention a result of a type which we believe to be hitherto unreported, which we obtained when the temperature dependence of the bromine-81 pure quadrupole resonance at about 240 Mc./s. in 1,2,4,5-tetrabromobenzene was investigated. Here, on raising the temperature above 20° C., there is as usual a linear decrease of frequency. However, a very sudden discrete drop occurs at 46.5° C., after which there is again a linear decrease. On then reducing the temperature, the increase of frequency is linear as far as 33.5° C., where there is a sudden discrete rise, the frequency returning to the original line and completing a hysteresis loop.

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