Combined Computational and Experimental Study of the Pressure Dependence of the Structural and Vibrational Properties on Solid Naphthalene C₁₀H₈

Abstract:

We present high-quality optical data and density functional theory calculations for the structural and vibrational properties of solid naphthalene (C₁₀H₈) under pressure up to 21.5 GPa. Our results demonstrate that almost all the modes shift toward higher frequencies and some peaks are broadened with increasing pressure. Comparing the pressure effect on the shortest intermolecular distances and on the bond lengths we confirm the expected result that the intramolecular interaction are less sensitive to pressure than the intermolecular interactions. These findings are shown to be in agreement with experimental results and hint towards the evolution of intermolecular interaction with pressure. Moreover, within our data the lattice modes exhibit more drastic changes than intramolecular modes, which are due to there being greater intermolecular distortions than intramolecular under applied pressure. In combination with theoretical and experimental studies, these results permit detailed characterization of the structural and vibrational changes of naphthalene as a function of pressure.

• Periodical: Materials Science Forum (Volume 914)
• Pages: 175-181
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.914.175
• Online since: February 2018
• Authors: Ling Ping Xiao*, Li Zeng, Xue Yang
• Keywords: Density Functional Theory, High Pressure, Polycyclic Aromatic Hydrocarbons

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