Basic forms of supramolecular self-assembly ­organized by parallel and antiparallel hydrogen bonds in the racemic crystal structures of six disubstituted and trisubstituted cyclopentane ­derivatives

Kálmán, A.; Argay, G.; Fábián, L.; Bernáth, G.; Fülöp, F.

doi:10.1107/S0108768101006723

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 6
Schematic diagram of patterns hoa1 and hea1 found in (IV) and (V). The long and short arrowheads represent the 1-COOH and 2-OH functions, while color distinguishes the enantiomers. Mixed color refers to stereoisomerism around C4. (a) All-cis diastereomer (IV). The separate homochiral tapes (T) of the enantiomers are cross-linked across centers of inversion (hoa1). They alternately form R²₂(12) dimers and R⁴₄(12) tetramers. (b) Diastereomer (V). The tert-butyl groups on the opposite side are shown by a black cross versus a white arrow and vice versa. The heterochiral meanders (M) are cross-linked via homomolecular pairs around 2₁ screw axes (hea1), while the inversion centers generate the R⁴₄(12) tetramers as in (IV). (c) A shift of the upper row by ½ of the translation leads to a novel pattern (hea2) if the screw axes are replaced simultaneously by twofold rotations. Both R⁴₄(12) tetramers and R²₂(12) dimers are preserved.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 57| Part 4| July 2001| Pages 539-550

doi:10.1107/S0108768101006723

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