issue contents

Journal logoSTRUCTURAL
CHEMISTRY
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
























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