issue contents

Journal logoSTRUCTURAL
ISSN: 2053-2296

February 1998 issue

Highlighted illustration

Cover illustration: A Topologically Novel Binuclear Silver Complex of Di-2-pyridyl Sulfide, see Anderson and Steel, pages 223-225. Displacement ellipsoids are shown at the 70% probability level for non-H atoms and H atoms are represented as spheres of arbitrary radii.

cif-access (organic compounds)

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2,3-Dihydro-8-hydroxy-5,7-dimethoxy-2-phenyl-4H-1-benzo-pyran-4-one was isolated from Uvaria dulcis Dunal. The determination of its crystal structure and that of its bromo derivative were carried out to confirm the structures proposed from spectroscopic data.

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This compound shows no unusual intramolecular or intermolecular distances or angles. The dihydrothieno[2,3-b]pyridine moiety is planar and the angle between this plane and that of the 4-phenyl ring is 85.8(1)°. The molecules are linked to form chains via intermolecular N-H⋯O hydrogen bonds.

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The coumarin moiety in this compound is planar and the tetrahydrobenzene ring adopts a half-chair conformation. The planes of the coumarin and phenyl rings form a dihedral angle of 50.97(8)°. The crystal structure is stabilized by O-H⋯O hydrogen bonds involving carbonyl and hydroxyl O atoms.

inorganic compounds

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CdSeO3.H2O has a layer structure consisting of octahedral trans [CdSeO3.H2O]i2 layers. The hydrogen bonding is exclusively intralayer.

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The tetrametaphosphimate rings in (NH4)4(PO2NH)4.4H2O exhibit a chair conformation and are linked by N-H⋯O hydrogen bonds to form columns along [100]. These columns are interconnected by O-H⋯O and N-H⋯O hydrogen bonds through the water molecules and ammonium ions.

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The structure of Na13K4Ga47.45 contains Ga12 icosahedra and oligomeric icosahedral units (Ga28 trimers) packed within a three-dimensional framework. The interpolyhedral voids are occupied by the alkali-metal cations.

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The structure of dilithium vanadyl silicate is isotypic with that of Li2TiOSiO4. It is built up from VO5 square pyramids sharing corners with SiO4 tetrahedra to form layers between which the Li ions are situated.

metal-organic compounds

organic compounds

addenda and errata

Acta Cryst. (1998). C54, 282
doi: 10.1107/S0108270198001127
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Erratum to Acta Cryst. (1997), C53, 1949-1950.

Acta Cryst. (1998). C54, 282
doi: 10.1107/S0108270198001139

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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