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Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

May 2000 issue

Highlighted illustration

Cover illustration: A simplified packing diagram showing the anionic network of tris­(2,2'-bi­pyridyl)nickel(II) thio­sul­fate heptahydrate, with H atoms omitted. See Freire et al. [Acta Cryst. C56, 541-543].

inorganic compounds


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The framework of Na2Co(H2PO4)4·4H2O is built up from cobalt complex ions of the form [Co(H2PO4)4(OH2)2]2− connected via hydrogen bonds.

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KNi3(AsO4)(As2O7) has a three-dimensional open anionic framework comprised of NiO6 octahedra, AsO4 tetrahedra and As2O7 groups sharing corners and edges. These delimit parallel tunnels running aong the b direction in which the K+ ions are located.

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A three-dimensional hydrogen-bonded network exists between [Co(SeO3)(NH3)4]NO3 and the water mol­ecule. The nitrate anion and water mol­ecule form open pores in the structure when hydrogen bonded to two neighboring [Co(SeO3)(NH3)4]+ cations.

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A re-investigation of the caesium titanyl arsenate room-temperature structure using a single-domain crystal shows that there is a substantial disorder of the Cs atoms over additional sites.

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The crystal structure of the title compound is built up from face-sharing TiF6 antiprisms and KF12 polyhedra. The compound seems to be optically isotropic at approximately 720 nm.

metal-organic compounds



















organic compounds























electronic papers (inorganic compounds)


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In the title compound, the anion has the I atom on an inversion centre and exhibits non-crystallographic symmetry close to \overline 3m. The cations are bonded exclusively to water ligands, in contrast to the situation in the disodium cobalt(II) salt [Rosu & Dickman (1999). Acta Cryst. C55, 11–13].

electronic papers (metal-organic compounds)


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The title compound contains a linear [Re2O3]4+ core and hexacoordinate ReV atoms. There is an inversion centre at the central bridging O atom. There is an inversion centre at the central bridging O atom. The distorted octahedral coordination of the ReV atom consists of an N2O2 donor set from the tetradentate imine–phenol ligand.

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The crystal structure of penta­carbonyl­(pyrrolidin-2-yl­idene)­chromium(0) shows strong interaction between the lone pair at nitro­gen and the carbene C atom, and a weak intermolecular hydrogen bond between N—H and a carbonyl ligand.

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In the title compound, [SnCl3(CH3)(C6H5SOCH2)2]n, determined as part of structural studies on adducts of halide–organotin compounds with sulfoxide derivatives, the octahedral SnIV centres are bridged by meso-1,2-bis­(phenyl­sulfinyl)­ethane ligands forming infinite chains along the [100] direction.

Acta Cryst. (2000). C56, e178
doi: 10.1107/S0108270100004819
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The title compound is isostructural with the copper(II) analogue. The structure consists of complex cations linked by hydrogen bonds to acetate anions.

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The structure of the title compound at 298 K is virtually identical to the 173 K structure reported previously [Weng, Das & Robinson (1990). Malays. J. Sci. 12, 57]. The primary coordination of the Sn atom in both mol­ecules of the asymmetric unit is in the form of a distorted tetrahedron. The distortion towards a trigonal-bipyramidal arrangement is brought about by a weak interaction between the Sn atom and the carbonyl O atom of the benzoate moiety.

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In the structure of the title compound, the W atom is octahedral with one axial and four equatorial carbonyl groups, and with an axial monodentate dipyridyl­amine ligand having the secondary amine NH and the uncoordinated pyridyl N atom directed towards and away from the W atom, respectively.

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The crystal structure of the title complex, studied as part of a systematic investigation of Mo(W) main-group hybrid clusters, contains discrete [BiI6]3− anions together with (HNC5H5)+ and (CH3COCH2NC5H5)+ cations separated by normal van der Waals contacts. The [BiI6]3− anion has the Bi atom on an inversion centre. The (HNC5H5)+ cation also lies about an inversion centre and is disordered. The (CH3COCH2NC5H5)+ cation lies in a general position.

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The title centrosymmetric copper(II) binuclear complex, prepared to observe how C—Se bonds are activated by transition metal active centers, is built from two symmetry-related [Cu{Se2CN(Et)2}2] units by pairs of Cu—Se bonds. The coordination geometry at the unique Cu atom is distorted square pyramidal, displaying Cu—Se distances ranging from 2.4091 (11) to 2.9095 (10) Å.

Acta Cryst. (2000). C56, e187
doi: 10.1107/S0108270100004492
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The title compound has a distorted square-pyramidal coordination with an Mn N bond length of 1.516 (2) Å at the apical position. The central five-membered chelate ring adopts a gauche conformation with the two phenyl groups in equatorial orientations.

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The title complexes show monomeric structures with a distorted square-pyramidal coordination. The two phenyl groups on the central five-membered chelate ring are both on the same side of the oxo ligand for the exo> isomer and on the opposite side for the endo> isomer.

Acta Cryst. (2000). C56, e190
doi: 10.1107/S0108270100004534
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The title mononuclear oxovanadium(IV) complex has a distorted square-pyramidal coordination. The complex was shown to be the exo> isomer.

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The title mononuclear iron(II) complex has a slightly distorted octahedral coordination. One of the thio­cyanate ions and one of the water mol­ecules of crystallization show positional disorder.

Acta Cryst. (2000). C56, e193
doi: 10.1107/S0108270100005540
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The title complex shows a binu­clear cage structure having an inversion centre. There are intramolecular N—H⋯O hydrogen bonds between the 7-aza­indole ligands and the bridging acetate O atoms.

Acta Cryst. (2000). C56, e194
doi: 10.1107/S0108270100005552
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In the title complex, two [Mn(salen)] moieties are connected through a μ-acetate bridge in a synanti fashion. The Mn⋯Mn distance is 5.365 (1) Å.

Acta Cryst. (2000). C56, e195
doi: 10.1107/S0108270100005564
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In the title dinuclear CuII compound, the coordination geometry around the Cu atoms is square pyramidal, with the bridging Cl atom at the apical positions. The Cu—Cl—Cu angle is 136.9 (1)° and the Cu⋯Cu distance is 4.961 (1) Å.

Acta Cryst. (2000). C56, e196
doi: 10.1107/S0108270100005576
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The title mono­nuclear copper(II) complex shows a distorted square-planar coordination. The benzoyl­amino N atom does not coordinate to the Cu atom and is involved in a weak bifurcated hydrogen bond with two F atoms of the hexa­fluoro­phos­phate anion.

Acta Cryst. (2000). C56, e197
doi: 10.1107/S0108270100005588
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The title mononuclear copper(II) compound shows a slightly tetrahedrally distorted square-pyramidal coordination with the chlorine ligand at the apical position. The directions of the two N—Me bond axes are syn with respect to the Cu—Cl bond.