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Journal logoSTRUCTURAL
ISSN: 2053-2296

April 2007 issue

Highlighted illustration

Cover illustration: A packing diagram for dibromidotetra­kis(tetra­hydro­furan)magnesium(II), viewed in the bc plane. C and H atoms have been omitted for clarity. Key: Mg atoms are shaded, Br atoms are dotted and O atoms are cross-hatched. See Lorbach, Lerner & Bolte [Acta Cryst. (2007), C63, m174-m176]

inorganic compounds

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The structure of the title compound is described as a cubic close-packed arrangement of O atoms containing Cu+/Cu2+ ions in a tetra­hedral coordination. Slabs of edge-sharing CrO6 octa­hedra and isolated CuO4 and GeO4 tetra­hedra are aligned parallel to the bc plane and are separated from each other by GeO4 tetra­hedra along a.

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This acidic ternary rare-earth sulfate is unique as it contains rare-earth monomers, [Ce(HSO4)(SO4)4]5−, and the structure is composed of these monomers, water mol­ecules, discrete hydrogensulfate ions and potassium ions held together by ionic inter­actions. There are two alternating layers in the structure, with the compositions [K4Ce(HSO4)(SO4)4] and [K2(HSO4)(H2O)]+.

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The title compound, lithium trimanganese bis­[tri­oxo­selenate(IV)] hexa­kis[hydrogentrioxoselenate(IV)], is built up from a vertex-sharing network of distorted MnIIIO6 octa­hedra, SeO3 and HSeO3 pyramids, and unusual Li(OH)6 octa­hedra, resulting in a dense three-dimensional structure. Mn, Li and one Se atom have site symmetries of \overline{1}, \overline{3}, and 3, respectively. An O—H⋯O hydrogen bond helps to establish the crystal packing.

metal-organic compounds

organic compounds

Special and virtual issues

Acta Crystallographica Section C is planning a special issue on

NMR Crystallography

The most recent special issue, published in November 2016, concerned

Scorpionates: a golden anniversary

Full details are available on the special issues page.

The latest virtual issue features Coordination polymers, with an introduction by Len Barbour.

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