issue contents

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

April 2000 issue

Highlighted illustration

Cover illustration: The bilayer of C-H...[pi]-bonded aromatic rings in 3-phenyl-1-(1-phenyl­ethyl)-4-(1-phenyl­ethyl­imino­methyl)­azetid­in-2-one. Only the aromatic C atoms and H atoms involved in the interactions are shown. See Kooijman et al. [Acta Cryst. C56, 481-483].

inorganic compounds


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The structure of HgWO4 consists of zigzag chains of edge-sharing WO6 and HgO6 octahedra running parallel to the c axis. Hg characteristically forms two short collinear Hg—O bonds.

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The title compound contains iron(II) octahedrally coordinated by diphosphates and water mol­ecules. The octahedra are connected in such a way that they form channels throughout the structure which contain the coordinated water mol­ecules.

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Rietveld refinements of monoclinic and triclinic AlPO4 tridymites show that their tetrahedral framework structures are isotypic with the silica analogues. The two forms of tridymite differ in distortions of the six-membered rings of tetrahedra, resulting in different superstructures. Both modifications co-exist at room temperature.

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SrCrP2O7 belongs to the structure family of α-Ca2P2O7. It consists of a three-dimensional network of [SrO9], [CrO5] and [P2O7] groups. Lattice constants of the whole series of isotypic compounds SrMP2O7 (M2+ = Cr, Zn or Cd) are compared with respect to the electronic configuration of M2+.

metal-organic compounds















organic compounds





























addenda and errata


electronic papers (inorganic compounds)


Acta Cryst. (2000). C56, e117
doi: 10.1107/S0108270100003395
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Nona­potassium cerium tetra­phospho­rus hexadeca­sulfide is a zero-dimensional material isostructural with the rubidium analogue.

electronic papers (metal-organic compounds)


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Recrystallization of trans-[Co(acac)2(PMePh2)(H2O)]PF6 (acac is pentane-2,4-dionato) from aqueous methanol gave purple prisms of the title compound. The molecular structure of the complex cation having a coordinated methanol ligand was revealed with a Co—O(methanol) distance of 2.059 (3) Å.


Acta Cryst. (2000). C56, e122
doi: 10.1107/S0108270100003255
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The coordination geometry around the Ni atom is square planar with a slight tetrahedral distortion. The five-membered chelate ring has a distorted gauche conformation with the phenyl groups in axial and equatorial orientations.

Acta Cryst. (2000). C56, e123
doi: 10.1107/S0108270100003358
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The title complex shows a distorted octahedral coordination and has a crystallographic twofold rotation axis. Intermolecular O—H⋯O hydrogen bonds form a two-dimensional network in the ab plane.

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The title compound, (Et4N)[ZnI4], is isostructural with the previously reported tetra­bromo­cadmate, whose coordinates were used as the starting parameters for both of the refinements presented here. The asymmetric unit comprises one anion and three cations, all of which are in special positions. The anion has five nearest-neighbour cations in the form of a square pyramid.

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Both the monoclinic and triclinic forms of the neutral title complex show an octahedral nickel(II) centre coordinated by two facial tridentate pyridylate ligands. The O-donor atoms of each ligand are trans.

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The CoIII ion is six-coordinate in a nearly octahedral environment (one Cl, one O and four N atoms) and the ZnII ion is four-coordinate in a distorted tetrahedral environment (three Cl and one O atom).

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The central Co atom of the title complex has a distorted octahedral coordination. The three Co—O bond distances are in the range 1.887 (2)–1.910 (2) Å, while the three Co—N bond distances are in the range 1.919 (2)–1.934 (2) Å. The ethanol solvate mol­ecule is involved in an O—H⋯O intermolecular hydrogen bond.

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The crystal structure of the title compound contains discrete monomeric mol­ecules of the carbene complex and solvent mol­ecules separated by normal van der Waals distances. The Pd atom is four-coordinate in an essentially square-planar environment, with the chlorine ligands mutually cis; Pd—P = 2.2495 (7), Pd—Cl = 2.3508 (7) and 2.3600 (7), Pd—C = 1.948 (2) and N—C(carbene) = 1.274 (3) Å.

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The title compound crystallizes as discrete ions, which form interionic hydrogen bonds of the type N—H⋯F.

electronic papers (organic compounds)


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In the title, compound, both chiral centers have the an S configuration. Both OH groups and both H atoms of the water mol­ecule form intermolecular hydrogen bonds with O⋯O distances in the range 2.7686 (18)–2.8717 (18) Å.

Acta Cryst. (2000). C56, e138
doi: 10.1107/S0108270100003231
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The absolute configuration at the new stereogenic centre, formed during the key step of the total synthesis, was established by X-ray analysis of the title compound.

Acta Cryst. (2000). C56, e139
doi: 10.1107/S0108270100003267
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In crystals of the title compound, the hydrogen fumarate anions form one-dimensional chains through O—H⋯O hydrogen bonding along the c and (a+b)/2 directions. There are three sites of the hydrogen fumarate, two of which have an inversion centre.

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The absolute configuration was determined for the title compound, which was prepared in a synthetic study on the natural products bryostatins. There are two independent mol­ecules which show similar conformations, except for the orientation of the methoxy groups.

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The absolute configuration was determined for the optically active title compound, which was prepared in a synthetic study on the natural products bryostatins.