Comparative high pressure Raman studies on perfluorohexane and perfluoroheptane

Kavitha, C. ; Narayana, Chandrabhas (2015) Comparative high pressure Raman studies on perfluorohexane and perfluoroheptane Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 150 . pp. 247-256. ISSN 1386-1425

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High pressure Raman spectroscopic studies on perfluorohexane and perfluoroheptane have performed up to 12 GPa. Perfluorohexane under goes two pressure induced transitions: (1) liquid–solid transition at 1.6 GPa and (2) solid–solid transition at 8.2 GPa. On the contrary, perfluoroheptane under goes three phase transitions, they are as follows: (1) liquid–solid transition at 1.3 GPa, (2) intermediate solid I transition at 3 GPa, (3) solid II transition at 7 GPa. The change in slope (dω/dP) shows that the solid I transition at 3.0 GPa could be the conversion of mid-gauche defect into trans conformers for perfluoroheptane. The pressure induced Raman spectra and the behavior of individual band with pressure shows that the solid phase comprises more than one conformer beyond crystallization. The intensity ratio for both the compounds shows that the high pressure phase beyond 8.2 and 7.0 GPa tends to have close packing with distorted all-trans conformers.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Perfluorocarbons; High Pressure; Raman Scattering; Phase Transitions; Trans-conformation; Gauche Defect
ID Code:113736
Deposited On:30 Apr 2018 11:52
Last Modified:30 Apr 2018 11:52

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