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Pressure-induced polymerization of fullerenes: A comparative study of C60 and C70

Sundar, CS and Sahu, PCh and Sastry, VS and Rao, GVN and Sridharan, V and Premila, M and Bharathi, A and Hariharan, Y and Radhakrishnan, TS and Muthu, DVS and Sood, AK (1996) Pressure-induced polymerization of fullerenes: A comparative study of C60 and C70. In: Phys. Rev. B, 53 (13). 8180 -8183.

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Abstract

To investigate the polymerization of fullerenes, solid C60 and C70 have been subjected simultaneously to high pressures and temperatures, with pressures up to 7.5 GPa and temperatures up to 800 °C. X-ray-diffraction measurements indicate that the fcc solid C60 transforms to an orthorhombic structure consisting of a polymerized linear chain of C60 molecules. The associated changes in the intramolecular vibrational modes have been probed through Raman and infrared measurements. In contrast to solid C60, under similar conditions, polymerization is not observed in the case of solid C70, although there is a structural transition from the initial hcp structure to a rhombohedral structure. This lack of polymerization in C70 is discussed in terms of the structure of solid C70 under high pressure and temperature conditions, coupled with the topochemical features of the C70 molecule.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Physical Society (APS)
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 16 Jan 2007
Last Modified: 19 Sep 2010 04:14
URI: http://eprints.iisc.ernet.in/id/eprint/1189

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