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 5
Parts of the crystal structures of (III) and (XXI) showing the formation of simple hydrogen-bonded chains of rings: (a) a stereoview of the chain of alternating R¹₂(6) and R₂²(8) rings in the 3-methylphenyl compound (III); (b) the C(4)C(6)[R₂²(8)] chain of rings in the 2,6-difluorophenyl compound (XXI), where the atoms marked with an asterisk (*), a hash (#) or an ampersand (&) are at the symmetry positions ( $[{1\over 2}- x, -{1\over 2}+ y, {1\over 2}- z]$ ), ( $[{1\over 2}- x, {1\over 2}+ y, {1\over 2}- z]$ ) and (x, 1 + 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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