Journal article

Do All-Metal Antiaromatic Clusters Exist?

As shown by detailed nucleus-independent chem. shift (NICS) analyses of the contributions of each MO, the very recently reported gas-phase all-metal Al4Li3- anion and its relatives (Kuznetsov, A.E.; Birch, K.A.; Boldyrev, A.I.; Li, X.; Zhai, A.I.; Wang, L.S. Science 2003, 300, 622) are arom. rather than antiarom. The paratropic (antiarom.) four-pi-electron contribution is overcome by the predominating diatropic effects of sigma aromaticity. However, true antiarom. all-metal clusters, such as Sn62- (Schiemenz, B.; Huttner, G. Angew. Chem., Int. Ed. Engl. 1993, 32, 297), do exist. [on SciFinder (R)]


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