Figure 5.
Arrangement of helical chains in crystal formed by 5 or 6 (Co3+ ion is shown in yellow sphere). (a) View of each helical chain is represented by the left-handed helix formed by Δ-isomers of 5 in blue (the left-side view) or the right-handed one by λ-isomers of 6 in red (the right-side view) along the c axis. (b) A stereoview of two left-handed single helices by Δ-isomers of 5 (blue). Two single helices do not intersect each other and do not form a double helix. (c) A stereoview of two right-handed single helices by λ-isomers of 6 (red).