Notizen: Molekülstruktur von Re3Cl6(Acac)3 im Feststoff / Molecular Structure of Re3Cl6(Acac)3 in the Solid State

1990 ◽  
Vol 45 (7) ◽  
pp. 1103-1104 ◽  
Author(s):  
Manfred Irmler ◽  
Gerd Meyer
Keyword(s):  
Molecular Structure ◽  
Solid State ◽  
Single Crystals ◽  
Unit Cell ◽  
Slow Evaporation ◽  
Out Of Plane

Dark red single crystals of Re3Cl6(Acac)3 are obtained from a solution of “ReCl3·2H2O” in acetylacetone by slow evaporation. The unit cell (monoclinic, P21/c, a = 1687.3(9), b = 963.4(5), c = 1664.3(9) pm, β = 108.97(4)°) contains four molecules of Re3Cl6(Acac)3. Each of the bidentate Acac(—) ligands substitutes one of the in-plane terminal and one of the out-of-plane terminal ligands with respect to the Re3 triangle.

scholarly journals Die Kristallstruktur des α-Na2S5 / The Crystal Structure of α-Na2S5

1984 ◽  
Vol 39 (5) ◽  
pp. 577-581 ◽  
Author(s):  
P. Böttcher ◽  
R. Keller
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Unit Cell ◽  
Melting Reaction ◽  
Orthorhombic Unit Cell ◽  
X Ray ◽  
In Cis ◽  
Excess Sulfur

Na2S5 has been Synthesized from β-Na2S2 and excess sulfur by a two step reaction. A solid state reaction at 200 °C was carried out, which was then followed by a melting reaction at 500 °C. X-ray investigations on single crystals revealed the structure of the α-modification. The orthorhombic unit cell contains four formula units; the space group is Pnma. The sulfur atoms form unbranched zig-zag-chains S52- in cis-conformation

Zwei neue Tetraphosphor-trichalkogeno-diiodide α′-P4Se3I2 und α′-P4S3I2 / Two New Tetraphosphorus-trichalcogeno-diiodies α′-P4Se3I2 and α′-P4S3I2

1984 ◽  
Vol 39 (6) ◽  
pp. 778-782 ◽  
Author(s):  
R. Blachnik ◽  
G. Kurz ◽  
U. Wickel
Keyword(s):  
Molecular Structure ◽  
Solid State ◽  
Unit Cell ◽  
Lattice Parameters ◽  
Molten State ◽  
Asymmetric Unit ◽  
Space Group ◽  
Nmr Data ◽  
Structure In Solution

Abstractα′-P4Se3I2 and α′-P4S3I2 were prepared by the reaction of P4S3 (P4Se3) with I2 in the molten state. The structure of α′-P4Se3I2 was determined. The compound crystallizes in the tetragonal space group I4̄2d with a - 1200.5(2) pm, c = 1518.8(4) pm, and eight molecules per unit cell. The structure was refined with 814 of 1402 observed reflections to a conventional residual of R = 0.045. One half of a molecule is forming the asymmetric unit. α′-P4S3l2 is isotypic with the lattice parameters a = 1182.2(2) pm and c = 1496.8(4) pm. 31P NMR data confirm that both modifica­tions have the same bicyclic molecular structure in solution as in the solid state and form an AA′BB′ system. Evidence is presented that the α-isomer is stabilized by the formation of two additional weak P-X bonds in this molecule.

Crystal Data for Thirteen Tellurates MIBaNbTe2O9 (MI = Li,Na,K,Rb,Ag) and BaNbTe2O9 (MII = Mg,Ca,Sr,Ba,Cu,Zn,Cd,Pb)

1989 ◽  
Vol 4 (1) ◽  
pp. 31-33 ◽  
Author(s):  
S. Launay ◽  
P. Mahé ◽  
M. Quarton
Keyword(s):  
Solid State ◽  
Single Crystals ◽  
Powder Diffraction ◽  
Solid State Reaction ◽  
Unit Cell ◽  
Crystal Data ◽  
Unit Cell Parameters ◽  
Orthorhombic Space Group ◽  
Cell Parameters ◽  
Diffraction Patterns

AbstractThirteen isotypic tellurates having the stoichiometries MIBaNbTe2O9 and BaNbTe2O9, with MI = Li,Na,K,Rb,Ag and MII = Mg,Ca,Sr,Ba,Cu,Zn,Cd,Pb, have been synthesized by solid state reaction. Single crystals of KBaNbTe2O9 were obtained. The compounds crystallize in the orthorhombic space group P212121 [19]. Unit-cell parameters for the 13 compounds and powder diffraction patterns for three representative compounds, KBaNbTe2O9, Ba1.5NbTe2O9 and Cd0.5BaNbTe2O9, are given.

An electron-diffraction study of the transformation α -Fe 2 O 3 to γ -Fe 2 O 3

1957 ◽  
Vol 241 (1224) ◽  
pp. 1-8 ◽  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Electron Diffraction ◽  
Diffraction Study ◽  
Single Crystals ◽  
Electron Diffraction Study ◽  
Magnetic Behaviour ◽  
Unit Cell ◽  
Prolonged Heating ◽  
Oxygen Ion

Outgrowths formed on haematite single crystals by heating in air have been examined by electron diffraction. At 500°C a change occurs in their crystal structure, apparently due to the migration of some cations to tetrahedral interstices. Otherwise, the unit cell and oxygen-ion framework of this 'β -phase’ remain as in α -Fe 2 O 3 (haematite). At 700°C the structure of the outgrowths changes to one characteristic of γ -Fe 2 O 3 and persists as such, even after prolonged heating at 900°C. Thus the transformation γ -Fe 2 O 3 to α -Fe 2 O 3 is not, as has been supposed, strictly irreversible, since the α-γ transition has now been found to occur under suitable conditions. The presence of β -phase traces seems to be the cause of the anomalous magnetic behaviour of haematite observed by Néel and others. It is concluded that the α-γ transformation is a necessary step preceding the solid-state spinelization reaction involved in the formation of a ferrospinel.

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

On the accuracy of determining the unit cell parameters of single crystals on modern laboratory diffractometers

2021 ◽  
Vol 62 (5) ◽  
Author(s):  
П.C. Серебренникова ◽  
В.Ю. Комаров ◽  
А.С. Сухих ◽  
С.А. Громилов
Keyword(s):  
Single Crystals ◽  
Unit Cell ◽  
Unit Cell Parameters ◽  
Cell Parameters

Fabrication and study the effect of the laser on the properties of the compound Tl2-xHgxBa2-ySryCa2Cu3O10+δ superconductor

2018 ◽  
pp. 168
Author(s):  
A. Kareem Dahash Ali ◽  
Nihad Ali Shafeek
Keyword(s):  
Transition Temperature ◽  
Solid State ◽  
Hydrostatic Pressure ◽  
Electrical Properties ◽  
Co2 Laser ◽  
Temperature Shift ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural And Electrical Properties

This study included the fabrication of    compound (Tl2-xHgxBa2-ySryCa2Cu3O10+δ) in a manner solid state and under hydrostatic pressure ( 8 ton/cm2) and temperature annealing(850°C), and determine the effect of the laser on the structural and electrical properties elements in the compound, and various concentrations of x where (x= 0.1,0.2,0.3 ). Observed by testing the XRD The best ratio of compensation for x is 0.2 as the value of a = b = 5.3899 (A °), c = 36.21 (A °) show that the installation of four-wheel-based type and that the best temperature shift is TC= 142 K  .When you shine a CO2 laser on the models in order to recognize the effect of the laser on these models showed the study of X-ray diffraction of these samples when preparing models with different concentrations of the values ​​of x, the best ratio of compensation is 0.2 which showed an increase in the values ​​of the dimensions of the unit cell a=b = 5.3929 (A °), c = 36.238 (A°). And the best transition temperature after shedding laser is TC=144 K. 

Determination of the structure of bis(propyldithiocarbamate)nickel(II)

1990 ◽  
Vol 55 (4) ◽  
pp. 1010-1014 ◽  
Author(s):  
Jiří Kameníček ◽  
Richard Pastorek ◽  
František Březina ◽  
Bohumil Kratochvíl ◽  
Zdeněk Trávníček
Keyword(s):  
Molecular Structure ◽  
Title Compound ◽  
Crystal And Molecular Structure ◽  
Heavy Atom ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Planar Configuration ◽  
Compound C ◽  
Heavy Atom Method

The crystal and molecular structure of the title compound (C8H16N2NiS4) was solved by the heavy atom method and the structure was refined anisotropically to a final R factor of R = 0.029 (wR = 0.037) for 715 observed reflections. The crystal is monoclinic, space group P21/c with a = 948.3(2), b = 776.9(2), c = 1 167.4(2) pm, β = 125.14(2)°, Z = 2. The molecule contains two four-membered NiSCS rings of approximately planar configuration with the Ni atom situated at a centre of symmetry. The molecules are arranged in chains along the c-axis of the unit cell.

Zum Mineral Johillerit verwandte Oxovanadate RbCd4V3O12 und TlCd4V3O12 / Oxovanadates RbCd4V3O12 and TlCd4V3 O12 Related to the Mineral Johillerite

1997 ◽  
Vol 52 (5) ◽  
pp. 663-668 ◽  
Author(s):  
B. Mertens ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Space Group ◽  
Related Compounds

Abstract Single crystals of I RbCd4V3O12 and TlCd4V3O12 II have been prepared by solid state reactions in closed iron tubes. The compounds crystallize closely related to the Johillerite structure in the space group C62h- C2/c with I: a = 13.058(3); b - 13.528(3), c = 7 .0 6 0 (2 )Å , β = 114.88(2)°; II: a = 12.999(6), b = 13.527(7), c = 7.055(3) Å , β = 114.88(4)°, Z = 4. Special features are the loss of Cu2+ in order to gain an additional Cd2+ position. The crystal structure is discussed with respect to related compounds of the Johillerite type.

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