issue contents

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

April 2001 issue

Highlighted illustration

Cover illustration: Packing diagram of ammonium 2,4-di­nitro-1-naphthalenolate viewed along [100]. See Yatsenko, Paseshnichenko, Chernyshev & Schenk [Acta Cryst. (2001), C57, 397-399].

inorganic compounds


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The structure of CaMn2O4, the parent compound in this structure class, has been redetermined. Octahedrally coordinated manganese(III) metal centers show expected Jahn–Teller distortions, and form edge-sharing dimers which pack in a herring-bone arrangement.

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Lithium manganese oxide crystals with composition (Li0.91Mn0.09)Mn2O4 were synthesized by a flux method. The crystals have a structure closely related to that of the cubic spinel LiMn2O4, but 9% of the lithium ions in the tetrahedral 4a site are substituted by Mn2+ ions. This substitution lowers the average Mn oxidation state below 3.5+, resulting in a Jahn–Teller distortion of the MnO6 octahedron.

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The structure of RbCu2VS4 is comprised of [Cu2VS4] layers within the (010) plane which are separated by Rb+ cations. The layers consist of a network of edge- and corner-sharing [VS4] and [CuS4] tetrahedra parallel to (010). The optical gap was determined as 1.45 eV.

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Rubidium molybdenum selenide crystallizes in the trigonal space group R\overline 3. Its crystal structure consists of a mixture of Mo12Se14Se6 and Mo15Se17Se6 cluster units in a 1:2 ratio. Both units are interconnected through Mo—Se bonds. The Rb+ cations occupy large voids between the different cluster units.

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Sr3ZnPtO6 and Sr3CdPtO6 crystals were grown from a KOH flux. The isostructural compounds adopt the rhombohedral K4CdCl6 structure type, featuring chains of face-shared ZnO6 or CdO6 trigonal prisms alternating with PtO6 octahedra along [001]. The metal–oxy­gen polyhedral chains are separated by Sr2+ cations.

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The crystal structure of Ba3(AlO4)H is isotypic with Ba3SiS5 and contains AlO45− and H anions. The hydride and oxide anions are coordinated by six Ba and five Ba/one Al atoms in an octahedral geometry. The hydrogen content was examined by MAS–NMR experiments of the deuterated compound.

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The title compound takes the YBCO-type structure [x = 0.74 (4)]. A careful structure analysis showed no atom mixing of the Sm atom at the Ba site and significant deficiency of oxy­gen content at the basal plane of the CuO6 octahedron.

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The structure of the title compound, consisting of two double crankshaft chains of disordered [(Si,Ge)O4] tetrahedra connected at right angles to each other and forming a framework, has been determined using a synchrotron X-ray source.

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The title compound is composed of corner-linked ZnN4/2 tetrahedra. Carbon and nitrogen form (CN2)2− dumb-bells with the C atom on a two fold axis. Nitro­gen is approximately trigonally planar coordinated by two Zn atoms and one C atom.

metal-organic compounds
























organic compounds

































addenda and errata



Special and virtual issues

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