Patterns of hydrogen bonding in mono- and di-substituted N-arylpyrazinecarboxamides

Wardell, S.M.S.V.; de Souza, M.V.N.; Vasconcelos, T.R.A.; Ferreira, M.L.; Wardell, J.L.; Low, J.N.; Glidewell, C.

doi:10.1107/S0108768107051804

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

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Figure 4
Parts of the crystal structures of (I) and (XXII) showing the formation of simple hydrogen-bonded chains: (a) a C(6) chain in the unsubstituted parent compound (I), where the atoms marked with an asterisk (*) or a hash (#) are at the symmetry positions (-1 + x, y, z) and (1 + x, y, z), respectively; and (b) a C(9) chain in the 2-chloro-4-fluorophenyl compound (XXII), where the atoms marked with an asterisk (*) or a hash (#) are at the symmetry positions ( $[-{1\over 2}+ x, -{3\over 2}+ y, z]$ ) and ( $[{1\over 2}+ x, {3\over 2}+ y, z]$ ), respectively. For the sake of clarity, the H atoms not involved in the motifs shown have been omitted.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 64| Part 1| January 2008| Pages 84-100

doi:10.1107/S0108768107051804

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