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Figure 4
Mol­ecule pairs IIa/IIb: x − [{1\over 2}], –y + [{3\over 2}], −z + 1 (top) and x − [{1\over 2}], −y + [{3\over 2}], −z + [{1\over 2}], –y + [{3\over 2}], −z + 1 (bottom). Values of energies by pair: Etot = −52.3 0 kJ mol−1, Ecoul = −59.10 kJ mol−1, Epol = −26.9 0 kJ mol−1, Edisp = −41.5 0 kJ mol−1 and Erep = 75.2 0 kJ mol−1. Inter­action energies were calculated using PIXEL3.1 (Gavezzotti, 2003BB9, 2008BB10) based on densities computed with G09 using the mp2/6–31** level of theory.

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