Fig. 5: ED maps, schematic models, and AFM images.
From: A case of antiferrochirality in a liquid crystal phase of counter-rotating staircases
ED maps and stylized models of Fddd phase of (a–d) IC3/12 and (e–h) FCN16, and (l, m) of the Col phase of FCN16. a, c, e, g 3D maps with high ED regions (aromatic) enclosed within the isoelectronic surface (see also Supplementary Movies 1 and 4). b, d, f, h Schematic models of winding rod-like molecular cores (“staircases”, see also Supplementary Movies 2, 3, 5, and 6). The two or three core end groups are colored differently for clarity. The high positional order is grossly exaggerated. For easier comparison of IC3/12 and FCN16 structures, the origin of the IC3/12 unit cell has been shifted along b axis by b/4; while IC3/12 columns are sitting on 2/1 helical axes, those of FCN16 are on the twofold rotation axes (see Supplementary Fig. 14). c, d, g, h View along b axis. i A more realistic model of h taking account of the 8° molecular tilt. j AFM of Fddd phase of FCN16 recorded at 50 °C (Fourier-filtered height image). The enlarged area shows alternating left- and right-handed columns; stacking faults of mismatched chirality and a helix reversal are indicated in j2. k original AFM image and inverse FFT of Col phase of FCN16. l ED map (time/space average by SAXS) and m, random twist model (an instantaneous arrangement) of Col phase of FCN16.
