Abstract
Different solid phases of dicyclopropylacetylene are studied for the first time using low-temperature Raman spectroscopy. Dicyclopropylacetylene (C8H10) appears in three solid phases and one mesomorphic phase. Besides three independent well-defined crystalline phases (I1, I2, II), on certain conditions a mixture of phases whose composition is not quite clear also exists. Between crystalline phases I1 and I2 a phase transition around 115 K is observed. The mesomorphic phase (I) which exists in the narrow temperature interval below the melting point (214 K) is assumed to be a glassy one.
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