Journal
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
Volume 107, Issue 5, Pages 1162-1169Publisher
WILEY
DOI: 10.1002/qua.21230
Keywords
endohedral fullerene chemistry; methane; DFT
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The endohedral fullerene CH4@C-84 has been studied using density functional theory (DFT) and second-order Moller-Plesset perturbation theory (MP2). In addition to the structure with a C-H bond of CH4 in a tetrahedral pocket conformation, we find an alternative minimum, very close in energy (6.3-9.5 kJ/mol higher according to the level of theory), with the methane inverted, which we call the antipocket conformation. Computed IR spectra are reported for CH4@C-84 and also for the reference system CH4@C-60. The calculated vibrational levels, in a harmonic approximation, reveal close-lying translational, librational, and shell-vibrational modes. The results are also presented for the isoelectronic species NH4+@C-60. (c) 2006 Wiley Periodicals, Inc.
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