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Figure 3
Com­parison of the hydrogen bonding to the anion in (a) Na2SO3(H2O)7, with displacement ellipsoids drawn at the 50% probability level, and (b) Na2CO3(H2O)7, with atoms as arbitrary spheres; hydrogen bonds are shown as thin solid lines. Atoms O1 and O3 in the sulfite structure accept three hydrogen bonds each, whereas O8 and O10 in the carbonate structure accept four each. Likewise, O2 in the sulfite structure accepts four hydrogen bonds, whereas the corresponding O9 atom in the carbonate accepts three. Note that the arrangement of the hydrogen-bonded water mol­ecules around SO32− is approximately mirror-symmetric (e.g. O5i and O6i), whereas it is less symmetric for the carbonate. Symmetry codes for atoms in Na2SO3(H2O)7 involved in hydrogen bonding with the SO32– anion are: (i) x, y, z; (ii) x + [{1\over 2}], y − [{1\over 2}], z; (iii) −x + [{3\over 2}], −y, z + [{1\over 2}]; (iv) −x + [{3\over 2}], −y, z − [{1\over 2}]; (v) −x + 1, −y, −z + 2; (vi) −x + 1, −y, −z + 3.

Journal logoSTRUCTURAL
ISSN: 2053-2296
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