Alkyl, hydrido-, and related compounds of ruthenium(II) with trimethylphosphine. X-Ray crystal structures of hydrido(tetrahydroborato-HH′)tris(trimethylphosphine)ruthenium(II), tri-µ-chloro-bis[tris(trimethylphosphine)ruthenium(II)] tetrafluoroborate, and bis[cis-methyltetrakis(trimethylphosphine)ruthenio]mercury(II)–tetrahydrofuran(1/1)

1984 ◽  
pp. 1731-1738 ◽  
Author(s):  
John A. Statler ◽  
Geoffrey Wilkinson ◽  
Mark Thornton-Pett ◽  
Michael B. Hursthouse
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Related Compounds

scholarly journals Crystal Chemical Relations in the Shchurovskyite Family: Synthesis and Crystal Structures of K2Cu[Cu3O]2(PO4)4 and K2.35Cu0.825[Cu3O]2(PO4)4

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 807
Author(s):  
Ilya V. Kornyakov ◽  
Sergey V. Krivovichev
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Structural Complexity ◽  
Crystal Chemical ◽  
X Ray Diffraction ◽  
Complexity Measures ◽  
X Ray ◽  
The Family ◽  
Similarities And Differences ◽  
Related Compounds

Single crystals of two novel shchurovskyite-related compounds, K2Cu[Cu3O]2(PO4)4 (1) and K2.35Cu0.825[Cu3O]2(PO4)4 (2), were synthesized by crystallization from gaseous phase and structurally characterized using single-crystal X-ray diffraction analysis. The crystal structures of both compounds are based upon similar Cu-based layers, formed by rods of the [O2Cu6] dimers of oxocentered (OCu4) tetrahedra. The topologies of the layers show both similarities and differences from the shchurovskyite-type layers. The layers are connected in different fashions via additional Cu atoms located in the interlayer, in contrast to shchurovskyite, where the layers are linked by Ca2+ cations. The structures of the shchurovskyite family are characterized using information-based structural complexity measures, which demonstrate that the crystal structure of 1 is the simplest one, whereas that of 2 is the most complex in the family.

scholarly journals ISOLATION AND X-RAY CRYSTAL STRUCTURES OF THE 1:1 COMPLEXES OF Pt(or Pd)Cl2WITH POLYTHIA[n](1,1′)RUTHENOCENOPHANES AND RELATED COMPOUNDS

1986 ◽  
Vol 15 (1) ◽  
pp. 121-124 ◽  
Author(s):  
Sadatoshi Akabori ◽  
Sadao Sato ◽  
Takehiko Tokuda ◽  
Yoichi Habata ◽  
Kayoko Kawazoe ◽  
...  
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Related Compounds

Importance of True Satellite Reflections in the Analysis of Modulated, Composite Crystal Structures. II. The Structure of [M'2Cu2O3]7[CuO2]10, M' = Bi0.04Sr0.96

1997 ◽  
Vol 53 (1) ◽  
pp. 125-134 ◽  
Author(s):  
A. F. Jensen ◽  
V. Petříček ◽  
F. K. Larsen ◽  
E. M. McCarron
Keyword(s):  
Synchrotron Radiation ◽  
Crystal Structures ◽  
Layered Structure ◽  
Second Order ◽  
Thermal Parameters ◽  
X Ray ◽  
First Order ◽  
Composite Crystal ◽  
Zigzag Pattern ◽  
Related Compounds

The structure of the modulated, composite crystal bismuth strontium cuprate [M′2Cu2O3]7[CuO2]10, with M′ = Bi0.04Sr0.96, has been determined and refined using a model which allows modulation of the atomic positional parameters for all atoms, as well as modulation of thermal parameters for the M′ site. The structure is orthorhombic, with c being the misfit direction and a = 11.4712 (6), b = 13.3765 (13) Å. Sublattice 1, of composition (CuO2)4, has c l = 2.7509 (10) Å, while sublattice 2, of composition (M′2Cu2O3)4, has c 2 = 3.9316 (3) Å. Superspace group Amma(001 + γ)ss\overline 1; q = γc l* with γ = 0.6997 (3); λ = 0.6565 Å, μ = 25.4 mm−1. The final residual is R all = 0.0474 for all 1174 reflections, R main = 0.0451 for the 549 main reflections, R 1.sat = 0.0562 for the 442 first-order satellite reflections and R 2.sat = 0.1044 for the 183 second-order satellite reflections. The satellite reflections have been collected with X-ray synchrotron radiation. It is shown that these reflections help to unambiguously determine the superspace group. The orthorhombic compound has a layered structure, stacked along the b axis. The first sublattice consists of layers of CuO2 ribbons, with CuO4 squares sharing edges along the c axis. The second sublattice consists of CuO4 squares, which are sharing edges in a zigzag pattern. In-between these layers the disordered layers of Bi and Sr atoms are sandwiched. A comparison with structurally and chemically related compounds is made.

Chiral metallocenes: the synthesis and X-ray crystal structures of TiCl2η5:η5-C5Me4SiMe2C5H3R*) (R* = menthyl or neomenthyl) and related compounds

2001 ◽  
Vol 79 (5-6) ◽  
pp. 731-741 ◽  
Author(s):  
Paul Beagley ◽  
Philip Davies ◽  
Harry Adams ◽  
Colin White
Keyword(s):  
Least Squares ◽  
Crystal Structures ◽  
Enantiomeric Excess ◽  
Racemic Mixture ◽  
Initial Reaction ◽  
Chiral Structure ◽  
Space Group ◽  
X Ray ◽  
Optically Pure ◽  
Related Compounds

The syntheses of the chiral ansa-metallocene complexes TiCl2(η5:η5-C5Me4SiMe2C5H3R*) (R* = menthyl (4a) or neomenthyl (4b)) are reported; initially 4a was obtained as a 3:1 mixture of (R:S) diastereoisomers, which differ only in which face of the asymmetrically substituted cyclopentadienyl ring is bonded to the titanium (chiral descriptor shown). The major diastereomer 4aR was crystallized out optically pure from the initial reaction mixture, whereas the 4aS diastereoisomer was isolated after isomerizing a racemic mixture of 4a to a 1:3 mixture of (R:S) diastereoisomers using UV irradiation. The corresponding neomenthyl complex 4b was obtained as a 1.3:1 mixture of diastereoisomers that could not be separated. The optically pure 4aR was converted stereoselectively into the corresponding (R)-TiMe2(η5:η5-C5Me4SiMe2C5H3R*) (R* = menthyl). Syntheses of the related indenyl ligand system C5Me4SiMe2C9H7 (3) is reported but complexation to titanium proved to be problematic although ZrCl2(η5:η5-C5Me4SiMe2C9H6) (6) was isolated. The crystal structures of both 4aR and 4aS are reported and compared. Crystals of 4aR are orthorhombic, a = 27.857(11), b = 9.985(5), and c = 9.596(4) Å, Z = 4, space group P212121 (D24, No. 19), and those of 4aS are monoclinic, a = 8.5810(10), b = 38.679(4), and c = 8.5842(10) Å, β = 113.001(2)°, Z = 4, space group P21 (C22, No. 4). The structures were solved by the Patterson method and 4aR was refined by blocked-cascade least-squares procedures to R = 0.0628 (Rω = 0.0503) for 902 reflections with |F|/σ(|F|) [Formula: see text] 3.0, whereas 4aS was refined by full-matrix least-squares procedures to R = 0.0646 (wR2 = 0.1829) for 5734 reflections with |F|/σ(|F|) [Formula: see text] 4.0. Both diastereomers of 4a catalyze hydrosilylation of ketones, but as expected from a comparison of the two crystal structures, the 4aR isomer is the more stereoselective catalyst, i.e., hydrosilylation of acetophenone followed by hydrolysis gives 82% enantiomeric excess (ee) of (S)-PhCH(Me)OH with 4aR whereas only 16% ee of (R)-PhCH(Me)OH with 4aS.Key words: titanium, metallocene, chiral, structure, catalyst.

Die Kristallstrukturen der Eisen- und Cobalt-Hexacyanokomplexe Rb2LiM(CN)6 und Rb2NaM(CN)6 / The Crystal Structures of the Iron- and Cobalt-Hexacyanocomplexes Rb2LiM(CN)6 and Rb2NaM(CN)6

1996 ◽  
Vol 51 (6) ◽  
pp. 826-831 ◽  
Author(s):  
Stefan Peschel ◽  
Werner Paulus ◽  
Dietrich Babel
Keyword(s):  
Neutron Diffraction ◽  
Single Crystal ◽  
Crystal Structures ◽  
Coordination Polyhedra ◽  
X Ray ◽  
Cyano Complexes ◽  
Related Compounds ◽  
Ray Methods

Abstract The crystal structures of four isotypic cyano complexes, belonging to the monoclinic type of cryolite (P21/n, Z = 2), were determined by single crystal X-ray methods and in one case also by neutron diffraction: Rb2LiFe(CN)6 (a = 717.3, b = 748.0, c = 1030.2 pm, β = 90.24°; Fe - C = 193.6, C - N = 114.5, Li - N = 227.0 pm), Rb,NaFe(CN)6 (a = 724.5, b = 772.5, c = 1055.2 pm, β = 90.39°; Fe - C = 193.9, C - N = 114.2, Na - N = 250.4 pm), Rb,LiCo(CN)6 (a = 715.5, b = 741.2, c = 1025.0 pm, β = 90.14°; Co - C = 189.6, C - N = 114.3, Li - N = 226.9 pm), Rb2NaCo(CN)6 (a = 722.5, b = 766.3, c = 1049.2 pm, β = 90.33°; Co - C = 189.9 (188.8), C - N = 113.4 (7/5.5), Na - N = 250.6 (249.6 pm). The irregular [RbN8l coordination polyhedra exhibit average distances close to Rb - N = 336 pm. Details are discussed and the results compared with those of related compounds

Coordination Chemistry of Lipoic Acid and Related Compounds, Part 1 Syntheses and Crystal Structures of the UV- and Light-Sensitive Lipoato Complexes [M(lip)2(H2O)2] (M = Zn, Cd)

1997 ◽  
Vol 52 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Henry Strasdeit ◽  
Angelika von Döllen ◽  
Anne-Kathrin Duhme
Keyword(s):  
Coordination Chemistry ◽  
Crystal Structures ◽  
Metal Nitrate ◽  
X Ray Diffraction ◽  
Carboxylate Ligands ◽  
X Ray ◽  
Layer Structures ◽  
Network Of Hydrogen Bonds ◽  
Related Compounds ◽  
Nm Range

The rac-lipoato (lip-) complexes [Zn(lip)2(H2O)2] (1) and [Cd(lip)2(H2O)2] (2) were obtained in good yields from solutions of sodium lipoate and the respective metal nitrate in methanol/water. 1 and 2 form pale yellow, moderately light-sensitive crystals.Both compounds were structurally characterized by single-crystal X-ray diffraction. 1: C2/c, a = 39.958(6), b = 5.360(1), c = 10.794(1) Å, β = 95.76(1)°, Z = 4, wR2 = 0.150 (all data). 2: C2/c, a = 38.200(2), b = 5.472(1), c = 11.179(1) Å, β = 92.72(1)°, Z = 4, wR2 = 0.090 (all data). The metal ions are hexacoordinated by the oxygen atoms of two chelating carboxylate ligands and two aqua ligands. The crystal structures are very similar but not isotypic. They are layer structures, in which the complexes within a layer are interconnected by a network of hydrogen bonds. Adjacent layers have contacts via the 1,2-dithiolanyl rings of their lipoato ligands.Crystals of 1 and 2 decompose on exposure to visible light or ultraviolet radiation in the 280-390 nm range. Photopolymerization by formation of intermolecular S-S bonds is very probably involved. Furthermore, the infrared spectra reveal the transformation of COO- into COOH groups

Syntheses, X-ray Crystal Structures, and Spectroscopic Properties of New Nickel Dithiolenes and Related Compounds

1997 ◽  
Vol 36 (6) ◽  
pp. 1218-1226 ◽  
Author(s):  
Francesco Bigoli ◽  
Paola Deplano ◽  
Francesco A. Devillanova ◽  
John. R. Ferraro ◽  
Vito Lippolis ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Properties ◽  
X Ray ◽  
Related Compounds

Transmission electron microscope studies in special ceramics

1978 ◽  
Vol 36 (1) ◽  
pp. 268-269
Author(s):  
A. Zangvil ◽  
L.J. Gauckler ◽  
G. Schneider ◽  
M. Rühle
Keyword(s):  
Phase Diagrams ◽  
Crystal Structures ◽  
Thin Foil ◽  
Limited Extent ◽  
Complex Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Lattice Resolution

The use of high temperature special ceramics which are usually complex materials based on oxides, nitrides, carbides and borides of silicon and aluminum, is critically dependent on their thermomechanical and other physical properties. The investigations of the phase diagrams, crystal structures and microstructural features are essential for better understanding of the macro-properties. Phase diagrams and crystal structures have been studied mainly by X-ray diffraction (XRD). Transmission electron microscopy (TEM) has contributed to this field to a very limited extent; it has been used more extensively in the study of microstructure, phase transformations and lattice defects. Often only TEM can give solutions to numerous problems in the above fields, since the various phases exist in extremely fine grains and subgrain structures; single crystals of appreciable size are often not available. Examples with some of our experimental results from two multicomponent systems are presented here. The standard ion thinning technique was used for the preparation of thin foil samples, which were then investigated with JEOL 200A and Siemens ELMISKOP 102 (for the lattice resolution work) electron microscopes.

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