November 1998 issue
cif-access (inorganic compounds)
The structure of tetrakis(methylammonium) hexachloroindate chloride, originally determined by Schlimper & Ziegler [Z. Naturforsch. Teil B (1972), 27, 377-379], has been redetermined and compared with the redetermination of Knop et al. [Can. J. Chem. (1987), 65, 1527-1555].
The title compound, ammonium manganese(II) digallium tris(phosphate) dihydrate, consists of GaO5, MnO6 and PO4 polyhedra linked to form a three-dimensional framework containing channels in which the NH4+ cations reside.
cif-access (metal-organic compounds)
The Cr octahedron is slightly distorted with the bond Cr-C opposite the P atom shortened to 1.845 (2) Å. The geometry of the P4 ring is not influenced by the addition of Cr(CO)5 and the cyclohexyl residues reveal an all-trans configuration.
The title compound was structurally characterized in an attempt to relate molecular structure properties with oxidative catalytic and high-affinity ligand-binding properties.
cif-access (organic compounds)
The title compound belongs to the family of sterically crowded alkenes. The molecule has a normal C3-C4 double-bond length of 1.3686 (14) Å and the torsion angles around this bond are in good agreement with the results of force-field calculations.
The structure of the p-nitrobenzoate title compound was required for stereochemical assignments of the precursor alcohol which was used in the stereoselective synthesis of the natural product paeonilactone B.
The structure and stereochemistry of the title compound, the enantiomer of the compound reported previously by Low et al. [Acta Cryst. (1995), C51, 2141-2143], are reported.
The structure of a new Cu-Zn bimetallic compound, poly[ammineaqua-di-μ2-cyano-μ3-cyano-copper(I)zinc(II)], is built up of infinite double sheets. Each sheet corresponds to a hexagonal network, with Zn and Cu atoms occupying alternate corners of the hexagons and cyano groups forming the edges. The sheets are connected into pairs by weaker Cu-C bonds completing the trigonal pyramidal coordination geometry of copper(I).
Single crystals of NaV2O5 are found to be centrosymmetric. The structure consists of edge- and corner-sharing V2O5 square pyramids. This structure allows only one V position in the asymmetric unit and V is therefore non-integer valent.
A cobalt-substituted aluminophosphate, Co0.65Al0.35PO4, with the zeolite gismondine topology encapsulating hydrogen-bonded (O⋯N) ethylenediamine is reported.