Determination of the crystal structures of the homologous (1R*,2R*)-trans-2-hydroxy-1-cyclopentanecarboxylic acid (5T), (1R*,2S*)-cis-2-hydroxy-1-cyclohexanecarboxylic acid (6C) and (1R*,2S*)-cis-2-hydroxy-1-cycloheptanecarboxylic acid (7C) proved a predicted pattern of supramolecular close packing. The prediction was based on the common features observed in the crystal structures of six related 2-hydroxy-1-cyclopentanecarboxylic acids and analogous carboxamides [Kálmán et al. (2001). Acta Cryst. B57, 539-550]. This pattern is characterized by tetrameric R(4)(4)(12) rings of C(2) symmetry formed from dimeric R(2)(2)(12) rings. The C(2) symmetry of such tetramers is not common in the literature, usually they have C(i) symmetry. Both types of tetramers are formed from dimers with similar or opposite orientation. The R(2)(2)(12) dimers differ in their hydrogen bonds. In 5T the monomers are joined by a pair of O1[bond]H...O2[double bond]C bonds, whereas in 7C they are joined by a pair of O3[bond]H...O1-H bonds. In 6C 60

作者：Alajos, Kálmán；László, Fábián；Gyula, Argay；Gábor, Bernáth；Zsuzsanna, Gyarmati

来源：Acta crystallographica. Section B, Structural science 2002 年 58卷 Pt 3 Pt 2期