Preparation and vibrational modes of C-60 center dot 2CHBr(3)

作者：Li HN^*; Li HY; Wu TQ; He SL; Sun YJ; Xu YB

来源：Chinese Science Bulletin, 2003, 48(10): 961-964.

DOI：10.1360/02ww0154

• C-60 center dot 2CHBr(3)
• high-T-c superconductivity material
• Raman scattering
• infrared adsorption

C-60 (.) 2CHBr(3) polycrystalline powder was prepared by the solution method. The vibrational modes of the sample were studied by Raman scattering and infrared adsorption techniques. The Raman spectra showed that the A(g) modes were downshifted by 4-5 cm(-1), while the Hg(1) mode was unshifted. The analyses of the downshifts of the Ag modes revealed that a small amount of electrons were transferred from the hydrogen atoms to the C-60 molecules. In the infrared spectra, the Flu modes of the pristine C-60 were unshifted after the intercalation with CHBr3. However, the vibrational modes of CHBr3 changed remarkably. The C-Br stretching mode was downshifted by similar to4 cm(-1). The adsorption of the C-H twisting mode was weakened obviously, and the adsorption of the C-H stretching mode was not observed. These results exhibited that there were nonnegligible interactions between CHBr3 and C-60 molecules, and that the strongest interaction took place between the hydrogen atoms and the C-60 molecules. The interaction should induce not only the changes of the vibrational modes reported here, but also those of the electronic states. So this work should offer important glues to the mechanism of the superconductivity at 117 K of the field-doped C-60 (.) 2CHBr(3).

• 出版日期2003-5
• 单位浙江大学