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Figure 2
Attractive σ⋯π (green) and repulsive π⋯π (red) interactions between two aromatic rings in three different arrangements: (a) parallel face-to-face, (b) parallel, offset and (c) T-shaped. For aromatic ring arrangements (b) and (c) are energetically favourable (the resultant force is weak attraction), while (a) is unfavourable (strong repulsion).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 68| Part 1| February 2012| Pages 57-65
https://doi.org/10.1107/S0108768111051159
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