Crystal Structure of β-D, 1 → 4 Xylobiose Hexaacetate

1973 ◽  
Vol 51 (8) ◽  
pp. 1215-1222 ◽  
Author(s):  
F. Leung ◽  
R. H. Marchessault
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Crystal Data ◽  
Bond Lengths ◽  
Structural Resemblance ◽  
Dimensional Crystal ◽  
Good Agreement

Three dimensional crystal structure analysis has been carried out on β-D, 1 → 4 xylobiose hexaacetate (1)[Formula: see text]The crystal data are: orthorhombic, P212121, a = 10.938(2), b = 8.377(4), c = 29.976(7) Å. It was found that the bond lengths and angles of the Cl chairs are similar to other carbohydrate structures, the conformational angles (Φ,Ψ) = (20.4°, −15.2°) and the orientations of the acetate groups are in good agreement with those predicted by stereochemical calculations using Flory functions. The structural resemblance between this molecule and the polymer, xylan diacetate, is discussed.

The crystal structure of [Pt(tetraethyldiethylenetriamine)I]I

1980 ◽  
Vol 58 (7) ◽  
pp. 664-668 ◽  
Author(s):  
Rosemary C. E. Durley ◽  
William L. Waltz ◽  
Beverly E. Robertson
Keyword(s):  
Crystal Structure ◽  
Least Squares ◽  
Structure Analysis ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Unit Cell ◽  
Platinum Atom ◽  
Full Matrix ◽  
Square Planar ◽  
Dimensional Crystal

Crystals of [Pt(Et4dien)I]I, where Et4dien = (C2H5)2NC2H4NHC2H4N(C2H5)2, have been prepared. A three dimensional crystal structure analysis has been carried out in a monoclinic unit cell having a = 12.565(8), b = 7.576(6), c = 21.040(15) Å, β = 91.12(2)° and space group P21/c, Z = 4. Full-matrix least-squares using 1982 independent, observed reflections converged at R = 0.067. The platinum atom has square-planar co-ordination. The orientation of the four ethyl groups with respect to the plane of the ligand is similar to that observed in related molecules, in spite of a lack of similarity of the molecular packing. The iodide ion appears to be hydrogen bonded to the ligand.

Tetraphenylphosphonium-nonachlorodivanadat(III), (PPh4)3[V2Cl9] · 7 CH2Cl2 / Tetraphenylphosphonium Nonachlorodivanadate(III), (PPh4)3[V2Cl9] · 7 CH2Cl2

1992 ◽  
Vol 47 (6) ◽  
pp. 814-818 ◽  
Author(s):  
Karin Ruhlandt-Senge ◽  
Alfred Dirk Bacher ◽  
Gertraude Koellner ◽  
Birgit Siewert ◽  
Ulrich Müller
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Crystal Data ◽  
X Ray ◽  
Metal Bonding ◽  
Metal Metal ◽  
Tetragonal Pyramidal ◽  
Approximate Composition ◽  
Insoluble Product

Reaction of VC14 with (Me3Si)2S in CH2C12 yields an insoluble product with the approximate composition VSC12. Its reaction with PPh4Cl in CH2Cl2 affords (PPh4)3[V2Cl9] · 7 CH2Cl2, whereas PPh4[VOCl4] is formed in the presence of oxygen. According to an X-ray crystal structure analysis, (PPh4)3[V2Cl9] · 7 CH2Cl2 contains [V2C19]3- ions having two face-sharing coordination octahedra but no significant metal-metal bonding (V-V distance 327.5 pm). Crystal data: a = 1386.4(7), b = 1405.6(7), c = 2710(2) pm, α = 95.800(5), β = 95.370(5), γ = 118.11(3)°, triclinic, Ρ 1̄, Ζ = 2; R = 0.066 for 8779 observed reflexions. PPh4[VOCl4] is isotypic with AsPh4[VOCl4] and contains tetragonal-pyramidal [VOCl4]- ions; tetragonal, P4/n, Z = 2, a = 1264.5(2), c = 772.0(2) pm; R = 0.050 for 654 observed reflexions.

Preparation and crystal data of isomorphous octamolybdates. Crystal structure analysis of (3-MepyH)2(3-EtpyH)2[Mo8O26]

1984 ◽  
Vol 90 (2) ◽  
pp. 115-120 ◽  
Author(s):  
P. Román ◽  
M.E. González-Aguado ◽  
C. Esteban-Calderón ◽  
M. Martínez-Ripoll
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Crystal Data

scholarly journals IPR Beamline for Macromolecular Assemblies at SPring-8 (BL44XU)

2014 ◽  
Vol 70 (a1) ◽  
pp. C1684-C1684
Author(s):  
Eiki Yamashita ◽  
Akifumi Higashiura ◽  
Masato Yoshimura ◽  
Kazuya Hasegawa ◽  
Yukito Furukawa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Diffraction Data ◽  
High Speed ◽  
Protein Crystallography ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Standard Type ◽  
Double Crystal ◽  
Macromolecular Assemblies

Biological macromolecular assemblies play significant roles in many biological reaction systems, including energy transfer, protein synthesis, protein degradation and signal transduction. A detailed understanding of the functions of the macromolecular assemblies requires information derived from three-dimensional atomic structures. X-ray crystal structure analysis is one of the most powerful methods to determine the three-dimensional structures of macromolecular assemblies at atomic level. Since features of crystals of biological macromolecular assemblies are extremely weak diffraction power and narrow space between the diffraction spots, it is essential to use high brilliance and high paralleled synchrotron radiation for diffraction data collection from crystals of biological macromolecular assemblies. The Institute for Protein Research (IPR) of Osaka University is operating a beamline for crystal structure analysis of biological macromolecular assemblies at SPring-8 (BL44XU). This beamline is designed to collect high quality diffraction data from biological macromolecular assembly crystals with large unit cells. The light source of this beamline is a SPring-8 standard type in-vacuum undulator. Liquid nitrogen cooled double crystal monochromator and horizontal focusing mirror are used as the optical components. BSS (Beamline Scheduling Software), which is SPring-8 protein crystallography beamline standard GUI, is installed to unify user operation throughout protein crystallography beamlines in the SPring-8. We have recently upgraded to a high speed air-bearing goniostat and installed a high performance CCD detector, MX-300HE. Present status and future plan of the beamline will be presented.

Crystal structure of low-cristobalite-type Al0.5Ga0.5PO4: A combined Rietveld refinement of neutron and X-ray diffraction data

2005 ◽  
Vol 20 (3) ◽  
pp. 207-211 ◽  
Author(s):  
S. N. Achary ◽  
A. K. Tyagi ◽  
S. K. Kulshreshtha ◽  
O. D. Jayakumar ◽  
P. S. R. Krishna ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Diffraction Data ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Tetrahedral Coordination ◽  
X Ray Diffraction ◽  
Rietveld Refinements ◽  
X Ray ◽  
Cell Parameters ◽  
Bond Lengths

The low-cristobalite-type modification of Al0.5Ga0.5PO4 is prepared by annealing the amorphous precipitate of stoichiometric phosphate at 1300 °C. The phase purity of the sample is ascertained by powder X-ray diffraction. The crystal structure is refined by Rietveld refinements of the neutron and X-ray diffraction data of the polycrystalline powder. This compound crystallizes in an orthorhombic lattice with unit cell parameters, a=7.0295(8), b=7.0132(8), and c=6.9187(4) Å, V=341.08(6) Å3, Z=4 (Space group C 2221, No. 20). The crystal structure analysis reveals the random distribution of the Al3+ and Ga3+ having tetrahedral coordination with typical M–O (M=Al3+:Ga3+) bond lengths as 1.74 Å. Similarly, the P5+ have tetrahedral coordination with typical P–O bond lengths 1.52–1.54 Å. The Mo4 and PO4 tetraheda are linked by common corners forming a three-dimensional framework lattice. The details of the crystal structure are presented in this paper.

Hybrid materials based on transition metal–BTC–benzimidazole: solvent assisted crystallographic and structural switching

CrystEngComm ◽  
2018 ◽  
Vol 20 (41) ◽  
pp. 6602-6612 ◽  
Author(s):  
Ranjay K. Tiwari ◽  
J. N. Behera
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Structure Analysis ◽  
Hybrid Materials ◽  
Coordination Polymers ◽  
Three Dimensional ◽  
Hierarchical Structures ◽  
Crystal Structure Analysis ◽  
Solvothermal Condition ◽  
1D Chain

Five transition metal–BTC–BIm based coordination polymers with hierarchical structures were synthesized under hydro/solvothermal condition. Crystal structure analysis of the compounds showed that 1 forms a 1D chain, 2 and 3 have 2D layers, while 4 and 5 have three-dimensional architectures.

Ein zweikerniger Vanadium(V)-Komplex mit (μ1)- und (μ-μ2:μ2)-gebundenen Hydrazido(2-)-Liganden / A Dinuclear Vanadium(V) Com plex with (μ1)- and (μ-μ2:μ2)-Bonded Hydrazido(2-) Ligands

1996 ◽  
Vol 51 (12) ◽  
pp. 1675-1678 ◽  
Author(s):  
Klaus Kopka ◽  
Rainer Mattes
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Single Crystal ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Title Complex ◽  
Metal Centers ◽  
Bond Lengths ◽  
Bridging Ligand ◽  
Single Crystal Structure Analysis

The title complex was obtained by reaction of guanidinium dioxodipicolinatovanadate(V) and N-methyl-N-phenylhydrazine. According to the single crystal structure analysis the dinuclear anion [(μ-PhNNH)(μ-OCH3){(MePhNN(dipic)V)}2]- with sevenfold coordinated metal centers contains two types of hydrazido ligands. The ligand [MePhNN]2- is terminally bonded, and the VNN unit is linear with extensive electron delocalisation. The V-N and N-N bond lengths are 167.9(5) and 131.9(6) pm, respectively. The bonding of the bridging ligand is of the hitherto unknown μ-μ2:μ2 type, with V-N and N-N bond lengths of 202.5(5) and 136.5(5) pm, respectively. The V(N2)V moiety is not planar. The compound was also characterized by 1H and 51V NMR spectroscopy.

Preparation and Crystal Structure of the Unusual Palladium(II) Chloride/Optically Active Sulfoxide Complex: µ-[(R,R)-1,5-Bis{o-(p-toluenesulfinyl)phenoxy}-3-oxapentane]-bis(µ-chloro)-dichlorodipalladium Dichloromethane Solvate, [Pd2Cl4(C30H30O5S2)].(CH2Cl2)2

1985 ◽  
Vol 38 (10) ◽  
pp. 1455 ◽  
Author(s):  
TW Hambley ◽  
B Raguse ◽  
DD Ridley
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Optically Active ◽  
Palladium Atom ◽  
Crystal Data

A complex between palladium(II) chloride and the optically active podand , (S,S)-1,5-bis[o-(p- toluenesulfinyl ) phenoxy ]-3-oxapentane, has been prepared and is shown to contain two equivalents of palladium(II) chloride to one equivalent of the podand. Crystal structure analysis shows each of the sulfur atoms in the sulfoxide groups is coordinated to a palladium atom, and the palladium atoms are also linked through chloride bridges. Crystal data: a 14.878(2), b 17.226(3), c 8.178(1) Ǻ, β 103.30(1)°; P21; Z 2.

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