Fig. 3: Single-crystal X-ray structure of 12·Li8.
From: The anti-aromatic dianion and aromatic tetraanion of [18]annulene
a, The asymmetric unit (interstitial solvent, hydrogen atoms and minor disorder components omitted for clarity) with C–Li distances in the range 2.175(4)–2.745(4) Å (internal ions) and 2.285(3)–2.591(4) Å (external ions) indicated by thin tubes. b,c, Two orthogonal views on the sandwich part: top view (b) and side view (c). Colour code: C, grey; O, red and Li, blue.
