Energetic analysis of the mol­ecular packing of 5,5′-dibromo-2,2′-bis­[4-(methyl­sulfanyl)phenyl]-4,4′-bipyri­dine: the role of π–π and halogen inter­actions

The crystal packing of the title compound, C₂₄H₁₈Br₂N₂S₂, is rationalized using the PIXEL method, which allows a separation of the inter­molecular inter­action energy into Coulombic, polarization, dispersion and repulsion contributions. Infinite (01) mol­ecular planes are formed through π–π stacking and other minor inter­actions, including a Br...S contact, with the σ hole of the Br atom pointing towards the S-atom lone pair. The title compound has crystallographically imposed twofold symmetry, with the twofold axis at the mid-point of the central C—C bond.