Sodium sulfite hepta­hydrate and its relation to sodium carbonate hepta­hydrate

Weil, M.; Mereiter, K.

doi:10.1107/S2053229620004404

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 2
(a) The crystal structure of Na₂SO₃(H₂O)₇ in a projection along [001], showing the layered character with cationic water–sodium layers at x ≃ 0, $[1 \over 2]$ alternating with sulfite layers (red polyhedra) at x ≃ $[1 \over 4]$ , $[3 \over 4]$ . (b) The crystal structure of Na₂CO₃(H₂O)₇ in a projection along [00 $[\overline{1}]$ ], showing the same type of layer stacking but a different orientation of the dimeric groups and adjacent carbonate anions at y ≃ $[1 \over 2]$ . For clarity, hydrogen bonds are displayed only in the lower half of the figures, with moderate O—H⋯O hydrogen bonds shown as green lines, weak O—H⋯O bonds as yellow lines and O—H⋯S hydrogen bonds as orange lines.

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 76| Part 5| May 2020| Pages 427-432

https://doi.org/10.1107/S2053229620004404

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