Polymerization and Pressure-Induced Amorphization of C60 and C70

Rao, CNR and Govindaraj, A and Aiyer, Hemantkumar N and Seshadri, Ram (1995) Polymerization and Pressure-Induced Amorphization of C60 and C70. In: Journal of Physical Chemistry, 99 (46). pp. 16814-16816.

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Abstract

Scanning tunneling microscopy of solid films of C-60 and C-70 clearly demonstrate the occurrence of photochemical polymerization of these fullerenes in the solid state. X-ray diffraction studies show that such a polymerization is accompanied by contraction of the unit-cell volume in the case of C-60 and expansion in the case of C-70. This is also evidenced from the STM images. These observations help to understand the differences in the amorphization behavior of C-60 and C-70 under pressure. Amorphization of C-60 under pressure is irreversible because it is accompanied by polymerization associated with a contraction of the unit cell volume. Monte Carlo simulations show how pressure-induced polymerization is favored in C-60 because of proper orientation as well as the required proximity of the molecules. Amorphization of C-70, on the other hand, is reversible because C-70 is less compressible and polymerization is not favored under pressure.

Item Type:	Editorials/Short Communications
Publication:	Journal of Physical Chemistry
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:	24 May 2011 04:46
Last Modified:	26 Oct 2018 07:10
URI:	http://eprints.iisc.ac.in/id/eprint/37863

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