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In the structure of 1,3-dibromo­azulene, C10H6Br2, the planar mol­ecule sits on a crystallographic mirror plane. The Br atoms are attached to the five-membered ring adjacent to the ring fusion. Head-to-tail charge-charge inter­actions due to partial positive charges on ring H atoms and partial negative charges within the aromatic ring system attract adjacent 1,3-dibromo­azulene mol­ecules together. This causes them to arrange themselves in a zigzag pattern that allows close packing of the oppositely charged groups.

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In the structure of 1,3-diiodo­azulene, C10H6I2, as expected, the mol­ecule is planar. Also observed are short contacts between I atoms and between I and ring C atoms. The crystal structure of this compound exhibits two sets of parallel layers, nearly perpendicular to each other. The layers are formed by charge-charge inter­actions between some I atoms and nearby seven-membered rings of mol­ecules in an adjacent layer. The packing is also affected by attractive dispersion forces between I atoms in adjacent layers.
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