Different forms of antiparallel stacking of hydrogen-bonded antidromic rings in the solid state: polymorphism with virtually the same unit cell and two-dimensional isostructurality with alternating layers

Kálmán, A.; Fábián, L.; Argay, G.; Bernáth, G.; Gyarmati, Z.Cs.

doi:10.1107/S0108768104024553

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

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Figure 4
Separate symbolic presentation of the common rings in the layer structures of (3) and (4). The symbols are the same as given in Fig. 2

and the ring constitutions are described in Table 3

. The five- and seven-membered rings are omitted, while the small triangles represent the amino groups. The antidromic R₄³(18) (A), R₄⁴(22) (B) and R₄³(12) (C) rings are closed by N—H⋯O=C hydrogen bonds and exhibit different dipole vectors in magnitude and direction. The O—H⋯O=C and N—H⋯O(H) hydrogen bonds form a homodromic R₄⁴(18) (D) ring.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 60| Part 6| November 2004| Pages 755-762

doi:10.1107/S0108768104024553

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