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![[Figure 2]](yp3167fig2mag.jpg)
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Figure 2
(a) A hydrogen-bonded chain in 2 of alternating pyrazine and hemimellitic acid molecules, together with the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level, with H atoms shown as spheres of arbitrary radii and dashed blue lines representing hydrogen bonds. The nonlabelled halves of the pyrazine molecules are related to the labelled halves by the symmetry operations (−x, −y, −z) (for pyrazine B) and (−x + 2, −y + 3, −z + 1) (for pyrazine C). (b) Neighbouring chains of 2 connected by centrosymmetric carboxylic acid group dimers. Colour code: green acid, blue pyrazine A and red pyrazine B. |
![[Figure 2]](yp3167fig2.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
