The electronic structures of c 6 0 and C60M (M=Li, Na, K , Rb and Cs) were calculated by using an atom superposition and electron delocalization molecular orbital method. The results indicate that s valence electron of the atom ofalkali metal was cornpletely transferred to 5T1, orbital of c 6 0 . The stabilization energy of the system results mainly from the electrostatic interaction between polarized CSO and alkali metal atom.
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