Fig. 2: Structural control of helical polyimines revealing identical mesoscopic helicity but reversed molecular-scale chiral stacking. | Nature Communications

Fig. 2: Structural control of helical polyimines revealing identical mesoscopic helicity but reversed molecular-scale chiral stacking.

From: Chiroptical isomerization in chiral covalent organic frameworks with identical mesoscopic helicity

Fig. 2: Structural control of helical polyimines revealing identical mesoscopic helicity but reversed molecular-scale chiral stacking.

a Structurally similar amine-formaldehyde monomers form RCOP-1/2/3. b–d SEM images of (b) RCOP-1, (c) RCOP-2 and (d) RCOP-3. e–g TEM images of (e) RCOP-1, (f) RCOP-2 and (g) RCOP-3. h DRCD and DRUV-Vis spectra of RCOP-1/2/3 and SCOP-1/2/3. i Reverse chiral stacking of aromatic segments within the same mesoscopic helical skeleton.

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