issue contents

Journal logoSTRUCTURAL
ISSN: 2053-2296

August 2000 issue

Highlighted illustration

Cover illustration: A mixed-valence iron complex of the antitumour drug 6-mercaptopurine: tris(6-mercaptopurine)iron(II) tetrachloroferrate(III) chloride. Ellipsoids are plotted at the 50% probability level and the tetrachloroferrate(III) anion is not shown. See Schmalle, Gyr & Dubler [Acta Cryst. (2000), C56, 957-959].

inorganic compounds

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The structure of Na2Ce(NO3)5·H2O consists of isolated chains of 12-coordinate Ce atoms. Na atoms and water mol­ecules are located between the chains.

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AgNbO3 is a tilted perovskite which is isostructural with NaNbO3 at room temperature.

metal-organic compounds

organic compounds

addenda and errata

electronic papers (inorganic compounds)

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The least protonated hexamolybdoplatinate(IV) polyanion, [H2α-PtMo6O24]6−, was isolated by using Nd3+ as a counter-cation. Two O atoms of the central PtO6 octahedron are protonated.

electronic papers (metal-organic compounds)

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The title compound adopts a monomeric three-legged piano-stool structure with one benzyl ligand disordered between two sites related by a ∼30° rotation about an axis defined by the Hf atom and the ipso-C atom of the benzyl ligand. There are no short Hf⋯Cipso contacts (no distances less than 3.1 Å), indicating no significant Hf–Ph interactions.

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The novel title ruthenium(II) complex was synthesized from the reaction of 1,2,4-triazepine, a new class of bidentate ligands, with [Ru(p-cymene)Cl2]2. The 1,2,4-triazepine ligand is coordinated to the metal centre through the N-4 and S atoms, forming a four-membered chelate ring. This is the first structural example of a transition metal complex containing a 1,2,4-triazepine ligand.

Acta Cryst. (2000). C56, e317
doi: 10.1107/S0108270100008945
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In methyl­tri­phenyl­stibonium tetra­fluoro­borate, prepared from triphenylantimony and trimethyloxonium tetra­fluoro­borate, there are four independent cations and anions in the asymmetric unit. The geometry around the Sb atom is distorted tetrahedral.

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The three-coordinate Ag atom in the title compound, prepared from bis­[acetato­(tri­phenyl­phosphine)silver] hemihydrate and 3,5-nitro­benzoic acid, shows trigonal–planar coordination [P—Ag—P = 147.1 (1)° and ΣAg = 359.0 (3)°]. Adjacent mol­ecules are linked through the O atoms of adjacent nitro groups [Ag⋯O = 3.205 (3) and 3.302 (4) Å] into a zigzag chain running parallel to the c axis of the monoclinic cell.

Acta Cryst. (2000). C56, e320
doi: 10.1107/S0108270100009185