High Pressure Phase of Biphenyl at Room Temperature: A Monte Carlo Study

Murugan, Arul N and Chandra, Prakash Jha and Yashonath, S and Ramasesha, S (2004) High Pressure Phase of Biphenyl at Room Temperature: A Monte Carlo Study. In: Journal of Physical Chemistry B, 108 (13). pp. 4178-4184.

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Abstract

A new pressure-induced solid phase of biphenyl is reported at room temperature. Isothermal-isobaric ensemble variable shape simulation cell Monte Carlo calculations are reported on biphenyl at 300 K as a function of pressure between 0 and 4 GPa. The potential proposed by Williams for intermolecular and Benkert-Heine- Simmons (BHS) for intramolecular interactions have been employed. Different properties indicating changes in the crystal structure, molecular structure, distributions of inter- and intramolecular energy are reported as a function of pressure. With increase in pressure beyond 0.8 GPa, the dihedral angle distribution undergoes a change from a bimodal to an unimodal distribution. The changes in IR and Raman spectra across the transition computed from ab initio calculations are in agreement with the experimental measurements. It is shown that at pressures larger than 0.8 GPa, competition between intermolecular interactions with intramolecular terms viz., conjugation energy and the ortho-ortho repulsion favors a planar biphenyl due to better packing and consequently a predominant intermolecular term. The exact value of the transition pressure will depend on the accuracy of the inter- and intramolecular potentials employed here.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry B
Publisher:	American Chemical Society
Additional Information:	copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	25 May 2006
Last Modified:	01 Mar 2012 10:16
URI:	http://eprints.iisc.ac.in/id/eprint/6863

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