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" Single crystal growth of C70S8 -a new phase in the C70-sulphur system." |
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A.V.Talyzin*, L.-E. Tergenius, U.Jansson |
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Department of Inorganic Chemistry, Uppsala University, Box 538, S-751 21 |
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Uppsala Sweden *Corresponding author. e-mail: [email protected] |
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Abstract Large crystals (up to 2*1*0.5 mm) of a new C70-sulphur compound were grown by evaporation of a benzene solution. The composition of this compound was determined by chemical analysis to C70S8. Single-crystal and X-ray powder diffraction experiments showed that the phase has orthorhombic structure with cell parameters a=30.18�, b=30.41�, c=28.32� and the space group Pbcn. The Raman spectrum from the new compound was very similar to those of pure C70 and sulphur with the exception of some changes in relative intensity and small shifts of a few peaks at wavenumbers below 500 cm-1. The results suggest that the C70-S8 interactions mainly consists of weak van der Waals bonds. Some irregularities in the peak shifts suggest that the distribution of S8 rings around the C70 molecules are less symmetrical that in the well-known C70S48 phase. keywords: C70, sulphur, fullerene, solution growth. |
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