issue contents

Journal logoSTRUCTURAL
ISSN: 2053-2296

August 2003 issue

Highlighted illustration

Cover illustration: A view of the structure of [mu]4-oxo-tetrakis([mu]-2,2,6,6-tetra­methyl­piperidinido)­di­mag­nes­ium­(II)­disodium(I), a new Na/Mg inverse crown ether. Ellipsoids are shown at the 50% probability level and H atoms have been omitted for clarity. See Kennedy, MacLellan & Mulvey [Acta Cryst. (2003), C59, m302-m303].

inorganic compounds

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The main building block of the crystal structure of monoclinic [UO2(NO3)2(H2O)2]·H2O is the finite non-centrosymmetric [UO2(NO3)2(H2O)2] cluster, which is a uranyl hexag­onal bipyramid that shares two non-opposite equatorial edges with the nitrate triangles, such that the two water mol­ecules are at neighbouring equatorial vertices. There is an interstitial water site in the structure, which is located between adjacent [UO2(NO3)2(H2O)2] clusters.

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The title microporous material, (K,Li)-(Al,Ge)-GIS, namely lithium potassium dialuminium digermanium octaoxide dihydrate, is the result of a 50% Li+ exchange into the K-(Al,Ge)-GIS structure. A structural change occurs due to disordering of K+ ions with Li+ ions along [001] and ordering of water mol­ecules along [101].

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Manganese antimony diselenide iodide is a distorted variant of the UFeS3 structure. The structure contains layers parallel to the bc plane that consist of edge- and corner-sharing MnSe6/2 and MnSe2/2I4/2 octahedra. Sb atoms are located between these layers and form SbSe3 trigonal pyramids.

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The refinements of two modifications of an adduct of potassium di­hydrogen­phosphate and hydro­fluoric acid were performed on data collected at 250 and 150 K, and at 292 and 150 K. Both modifications contain a very short F—H⋯O hydrogen bond. The modifications differ in the arrangement of the di­hydrogen­phosphate anions and the hydrogen-bonding schemes.

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A new cubic form, in space group F\overline 43m, of Cs[Mg(H2O)6](PO4) has been found and is isostructural with the analogous arsenate. [Mg(H2O)6]2+ cations and phosphate anions are connected by hydrogen bonds, forming a sphalerite-like three-dimensional framework.

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The room-temperature structure of the B-site-ordered complex perovskite dicalcium magnesium tungstate, Ca2MgWO6, has been determined by simultaneous Rietveld refinement of neutron and X-ray powder diffraction patterns. Ca2MgWO6 is characterized by B-site ordering and an aac+-type BO6 octahedral tilt mechanism.

metal-organic compounds

organic compounds

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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