2. Hydrogen bonding, molecular interactions, and crystal engineering
Stacking of six-membered aromatic rings in crystals

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Abstract

Geometrical preferences of stacking and the possibilities and limitations of using stacking in designing crystal structures have been analyzed, based on the crystal structures of benzenes, pyridines and s-triazines. It is shown that crystallographic symmetry imposes severe restrictions on stacking parameters and that alteration of the π-electron distribution in the aromatic ring by incorporation of heteroatom(s) significantly increases the possibility of stacking.

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