7.8-Dioxa[6]helicene exhibits arrested chirality in the crystalline state. The asymmetric unit contains 8 different, stacked helical molecules of which two are disordered. The molecules appear in homochiral (3 x 1 x () strings. Further analysis indicates that there can be domains of enantiomeric excess and a dipolar structure reminiscent of 1-D Ising behaviour.
F. C. Krebs, A. Faldt, N. Thorup and K. Bechgaard, CrystEngComm, 1999, 1, 21 DOI: 10.1039/A907083D
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