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Do Special Noncovalent pi¨Cpi Stacking Interactions Really Exist?
Angew. Chem. Int. Ed. 2008, 47, 3430 ¨C3434

Thus, the term ¡°pi-pi stacking¡± should be used as a geometrical
descriptor of the interaction mode in unsaturated molecules
and to understand pi¨Cpi interactions as a special type of
electron correlation (dispersion) effect that can only act in
large unsaturated systems when they are spatially close, which
is only possible in the stacked orientation.
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