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Figure 5
(a) Schematic of the twisting mode of the diacid molecules in crystals. The torsions at both ends (O1—C1—C2—C3 and O3—Cn—Cn−1—Cn−2) are named τ1 and τ2, respectively. (b) Conformations in form I and II of the six diacids. Top and bottom views are shown for comparison of τ1/τ2 among the diacids.

IUCrJ
Volume 7| Part 3| May 2020| Pages 422-433
ISSN: 2052-2525
https://doi.org/10.1107/S205225252000233X