Figure 2
The packing of (a) (I) and (b) (II). Strychninium cations [solid lines in (a)] form pillars. Channels between neighboring strychninium pillars are occupied by (a) 4-chlorobenzoate (open lines) and (b) 4-nitrobenzoate anions. For clarity, H atoms have been omitted. Dashed lines indicate hydrogen bonds. |