issue contents

Journal logoSTRUCTURAL
ISSN: 2053-2296

April 2013 issue

Highlighted illustration

Cover illustration: The heavy-atom framework in MgSO4·11H2O (with H atoms omitted for clarity). Dashed and solid lines are used to distinguish the hydrogen-bonded rings in different planes. See Fortes, Wood & Gutmann [Acta Cryst. (2013), C69, 324-329].


inorganic compounds

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A sample of Li0.41(NH4)0.59ClO4 was prepared by gel diffusion using agar agar gel as the medium of growth at ambient temperature. The Cl and mixed Li/N atoms are located on special positions. The structure features a twofold inter­penetrated three-dimensional entanglement architecture, in which single three-dimensional networks are constructed from tetra­hedral coordination based on diamondoid arrays. The crystal structure is compared with those of related compounds.

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Four clathrates with type-I and type-II structure are reported in the K–Ba–Ga–Sn system. For the type-I compound, all framework sites are occupied by a mixture of Ga and Sn atoms, with Ga showing a preference for Wyckoff site 6c. For the type-II structures, only the smaller (Ga,Sn)24 penta­gonal dodeca­hedral cages are filled, while the (Ga,Sn)28 hexa­kai­deca­hedral cages remain empty.

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The structure of magnesium sulfate undeca­hydrate and its hexa­valent chromium-bearing analogue are compared, elucidating details of the strain distribution through the hydrogen-bonded structure due to the substitution of a much larger oxyanion.

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Analysis of the title compound, diiron(III) tris­ulfate–sulfuric acid–water (1/1/28), at 100 and 200 K reveals the structural features of an alum, (H5O2)Fe(SO4)2·12H2O. The Fe(H2O)6 unit is located on a centre of inversion, while the H5O2+ cation is located about an inversion centre. The compound thus represents the first oxonium alum, although the unit cell is ortho­rhom­bic.

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The crystal structure of KAlSiO4-O1 was refined from single-crystal data, taking multiple twinning into account. Electron microprobe analysis confirmed that the compound is not stoichiometric.

metal-organic compounds

organic compounds

addenda and errata

Special and virtual issues

Acta Crystallographica Section C is planning special issues on

The Structural Chemistry of Homogeneous and Heterogeneous Catalysts

NMR Crystallography

Full details are available on the special issues page.

The latest virtual issue, featuring Coordination polymers and with an introduction by Len Barbour, was published in July 2014.

What are the 'most read' articles from the recent special issues?

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