The Heat Capacity Anomaly in Phenanthrene; Effects of Deuteration, Purification and Dissolution

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Abstract
Arndt and Damask1 reported a heat capacity anomaly of 380 cal/mole in phenanthrene around 70°C. An electrical anomaly occurs at the same temperature and has also been described in detail.2 No explanation as yet exists for these phenomena. Further studies being conducted involve the use of fully deuterated phenanthrene but, since this is available only in limited quantities, some of the purification procedures had to be omitted. It was of interest to see if these omitted procedures suppressed the heat capacity anomaly to any extent, since it has been reported that impurities and radiation suppress the electrical anomaly.2 Accordingly, the heat capacity anomaly of phenanthrene was remeasured under different conditions.

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