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Abstract
The results of an accurate thermal analysis on highly purified samples of 2-methylpropan-2-01 supply evidence for the supposition of the existence of three Crystalline phases, which we indicate as crystal I (mp 25.62 C), crystal I1 (mp 25.00 C), and crystal I11 (mp 21.66 C). A two-slde transltlon: crystal I G I1 has been observed at 14.1 O C . Crystal 111, by cooling, undergoes a sluggish transltlon Into crystal 11 at 9 OC. Cryoscopic behavior of solutions of carbon tetrachloride, n-heptane, and sulfolane is consistent with the above results. Metastable equilibria may be detected owlng to the fact that the freezing points of the three crystalline phases fall withln a narrow temperature range. The cryoscopic constants of the three solid phases have been calculated and fusion entalpies derived. Negative conclusions are drawn concerning the use of 2-methylpropan-2-01 as a reliable solvent in cryoscopy. From thermodynamic data only crystal I1 Is suspected, possessing some globular character.
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