issue contents

ISSN: 2056-9890

July 2014 issue

Highlighted illustration

Cover illustration: The alkyne dicobalt clusters [Co2(C8H11BrO3)(CO)6] and [Co2(C12H16Br2O4)(CO)6] feature asymmetric (illustrated) or symmetric alkynes, classic tetrahedral C2Co2 cluster cores, with each carbon atom of the alkyne bridging two Co atoms, and highly distorted octahedral geometries. Inversion dimers are found in the crystal structure of the asymmetric cluster mediated by hydroxyl-O-H...O(hydroxyl) hydrogen bonds. See: McAdam, Moratti, Robinson, Simpson & Stanley [Acta Cryst. (2014). E70, 9-13].


international union of crystallography

research communications

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The structures of two alkyne-hexacarbonyl-dicobalt complexes are reported, each with potential ATRP initiator substrates as substituents on the alkynes. The complexes each form tetrahedral C2Co2 cluster cores with classical sawhorse conformations, while a feature of the crystal packing is the formation of inversion dimers for both molecules.

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The basic building units of the hydrous periodate Pb3(IO4(OH)2)2 are three Pb2+ cations and two IO4(OH)23− anions. The octa­hedral anions are arranged in a distorted hexa­gonal rod packing, with the cations (each with a coordination number of eight) located in between.

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The title molecules, HL1 and HL2, differ in their conformation with the pyridine ring being inclined to the pyrazine ring by 61.34 (6) and 84.33 (12)°, respectively. The crystal packing is also slightly different, with molecules of HL1 linked by pairs of N—H⋯N hydrogen bonds, forming inversion dimers, while for HL2 molecules are linked by N—H⋯N and C—H⋯N hydrogen bonds, forming chains along [010].

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The title compound, a hydrated copper acetate complex of the ligand N-[(pyridin-4-yl)methyl]pyrazine-2-carboxamide, has a metal-organic framework (MOF) structure with a 10 (3) network topology. The water molecules are located in the cavities of the framework and linked to it by O—H⋯O hydrogen bonds.

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In the title layered, mixed-valence ammonium vanadium tellurite, the VV atom are tetrahedrally coordinated and the VIV atoms adopt distorted octahedral coordination geometries. The presumed TeIV lone pairs of electrons are directed inwards into lacunae in the double polyhedral layers.

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The platinum(II) complex with notable antitumor activity shows a slightly distorted square-planar coordination and intramolecular C—H⋯Cl and intermolecular N—H⋯Cl and C—H⋯O hydrogen bonds.

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2,5-Di­azido-1,4-phenyl­ene di­acetate and dibutyrate are the first structurally characterized representatives with a trans-di­azido­phenyl­ene entity. Both mol­ecules possess inversion symmetry; however, the compounds crystallize in different crystal systems (triclinic versus monoclinic).

inorganic compounds

metal-organic compounds

organic compounds