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Stable and metastable solid phases of dicyclopropylacetylene

Different solid phases of dicyclopropylacetylene are studied for the first time using low-temperature Raman spectroscopy. Dicyclopropylacetylene (c8HIo) appears in three solid phases and one mesomorphic phase. Besides three independent welldefmed crystalline phases (II, 12, 11), on certain conditions a mixture of phases whose composition is not quite clear also exists. Between crystalline phases II and 12 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.

diciclopropylacetylene ; Raman ; low temperature ; polycrystalline solid ; metastable phase ; phase transition ; internal rotation

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