Fig. 4. Proposed mechanism for the SCSC transformation from 1-0D to 1-1D.

a Contraction of the structure in the ac-plane. In the crystal of 1-0D, the hydrogen-bonded complex cations and anions form 1D helical architectures possessing both left and right handedness around the crystallographic C₂ axes (left panel), while the 1D helices in 1-1D exhibit identical handedness (right panel). b Chiral interconversion of complex cation with Δ configuration during the transformation from 1-0D to 1-1D with right handedness. c Contraction of structure along the crystallographic b axis. The green and yellow dashed lines denote the strong O–H···O hydrogen-bond interactions. The sulfates should substitute the eg ligands along the bold green dashed lines. Zn, blue; O, red; C, gray; S, yellow.