We have used an ab initio self-consistent field(SCF) molecular orbital approach toinvestigate the equilibrium geometry and relative stability of C4S4m- (m=0,1,2,3,4). We foundthat the geometry of anions studied from m=0 to m=4 changes from non-aromatic structure toaromatic structure and fmally anti-aromatic structure and that the relative stability decreases inthe order of: C4S4m- > C4S42- > C4S4 > C4S4 > C4S4.
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