 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 3]](bs5037fig3mag.jpg)
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Figure 3
Difference-Fourier maps (to a maximum sin θ/λ value of 0.625 Å−1, 100% completeness) taken from the mean plane through C7, O8 and O9 from datasets collected from the first crystal of the new polymorph of 2,4-dihydroxybenzoic acid at (a) 90, (b) 100, (c) 110 and (d) 150 K (bottom right). All areas of negative electron density are shown shaded dark to make the positive areas clearer; the latter are contoured at 0.06 e Å−3 intervals. The computations reported here were undertaken in response to the observation of small secondary density peaks at positions consistent with possible cooperative disorder in the hydrogen-bonded system. However, repeated measurements on a range of crystals effectively eliminate this possibility, as do the computations. |
![[Figure 3]](bs5037fig3.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
