Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1876
Title: Comparative high pressure Raman studies on perfluorohexane and perfluoroheptane
Authors: Kavitha, C.
Narayana, Chandrabhas
Keywords: Spectroscopy
Perfluorocarbons
High pressure
Raman scattering
Phase transitions
Trans-conformation
Gauche defect
N-Alkanes
Phase-Transitions
Vibrational-Spectra
Infrared-Spectra
Polytetrafluoroethylene
Perfluoroalkanes
Absorption
Scattering
Poly(Tetrafluoroethylene)
Adsorption
Issue Date: 2015
Publisher: Pergamon-Elsevier Science Ltd
Citation: Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy
150
Kavitha, C.; Narayana, C., Comparative high pressure Raman studies on perfluorohexane and perfluoroheptane. Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy 2015, 150, 247-256.
Abstract: 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 (d omega/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. (C) 2015 Elsevier B.V. All rights reserved.
Description: Restricted access
URI: http://hdl.handle.net/10572/1876
ISSN: 1386-1425
Appears in Collections:Research Articles (Chandrabhas N.)

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