X-ray crystal structure investigation of 2,3,6,8-tetrahydro-10-methyl-7H-l,4-dioxino [2,3-h] [1,4] benzodiazepin-7-one

1999 ◽  
Vol 40 (2) ◽  
pp. 334-337
Author(s):  
A. N. Chekhlov
Keyword(s):  
Crystal Structure ◽  
Structure Investigation ◽  
X Ray

Notizen: The Crystal Structure of N3P3C15(NPPh3) — a Novel Conformation in Phosphazenylcyclophosphazene Chemistry

1976 ◽  
Vol 31 (7) ◽  
pp. 999-1000 ◽  
Author(s):  
Y. Sudhakara Babu ◽  
T. Stanley Cameron ◽  
S. S. Krishnamurthy ◽  
H. Manohar ◽  
Robert A. Shaw
Keyword(s):  
Crystal Structure ◽  
Crystallographic Structure ◽  
Type I ◽  
Type Ii ◽  
Structure Investigation ◽  
X Ray ◽  
Ring Segment

An X-ray crystallographic structure investigation of pentachloro(triphenylphosphazenyl)cyclotriphosphazatriene, N3P3C15(NPPh3), reveals a novel conformation (type I) of the triphenylphosphazenyl group with respect to the adjacent ring segment. This is contrasted with the structure of gem. –N3P3CI4Ph(NPPh3), where a type II conformation is observed.

scholarly journals Kristallstrukturuntersuchung an einem bismuthaltigen Hollandit: Bi1.9CU4V4O16 / Crystal Structure Investigation of the Bismuth Containing Hollandite: Bi1.9Cu4V4O16

1995 ◽  
Vol 50 (8) ◽  
pp. 1163-1166 ◽  
Author(s):  
J. Feldmann ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Lone Pair ◽  
Lattice Energy ◽  
Tetragonal Symmetry ◽  
Structure Investigation ◽  
X Ray ◽  
Laser Heated ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Bi1.9Cu4V4O16 have been prepared by quenching of CO2-LASER heated samples. They were investigated by X-ray techniques. The compound crystallizes with tetragonal symmetry, space group C54h-I4 /m , a = 9.945(2) Å , c = 2.915(3) Å, Z = 1, and is isotypic to the mineral Hollandite. Bi1.9Cu4V4O16 is the first Hollandite with a statistical distribution of vanadium and copper in the network of octahedra. Calculations of the Coulomb terms of lattice energy led to a distance of bismuth to the lone pair of 1.07 Å. Considering the lone pair as part of the coordination sphere of Bi3+ a square pyramidal polyhedron is obtained.

Kristallstrukturuntersuchung des Kupfer-Cadmium-Oxovanadats CuCdVO4 / Crystal Structure Investigation of the Copper Cadmium Oxovanadate CuCdVO4

1995 ◽  
Vol 50 (6) ◽  
pp. 871-874 ◽  
Author(s):  
J. Feldmann ◽  
S. Münchau ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Structure Investigation ◽  
Space Group ◽  
X Ray ◽  
Laser Techniques ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of CuCdVO4 have been prepared by CO2-LASER techniques. X -ray investigations of the black single crystals led to orthorhombic symmetry, space group D2h17-Cmcm , a = 5.921(1), b = 9.065(4), c = 6.633(2) Å, Z = 4. CuCdVO4 represents the first example of a quaternary oxide containing cadmium and copper(I). Compared to AgCdVO4, CuCdVO4 shows a different linkage of the VO4 and CuO4 tetrahedra, explaining the missing isotypy of these com pounds.

The Structure Investigation of Copper, Nickel and Iron Hexacyanometalates from Conventional X-Ray Powder Diffraction Data

2004 ◽  
Vol 443-444 ◽  
pp. 345-348 ◽  
Author(s):  
Irena Petrovic-Prelevic ◽  
Antje Widmann ◽  
Heike Kahlert ◽  
Harm Wulff ◽  
Fritz Scholz
Keyword(s):  
Crystal Structure ◽  
Prussian Blue ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Rietveld Method ◽  
Mixed Crystals ◽  
Powder Diffraction Data ◽  
Structure Investigation ◽  
Prussian Blue Analogue ◽  
X Ray

The crystal structure of new Prussian blue analogue samples, KCu[Fe1-x Cox(CN)6], KNi[Fe1-x Cox(CN)6] and Fe[Fe1-x Cox(CN)6], was solved on the base of the model from Keggin and Miles [1] and refined by the Rietveld method [2] from conventional X-ray powder diffraction data. These compounds form mixed crystals for all Fe/Co ratios. The crystal structure of the KCu[Fe0.3Co0.7(CN)6], KNi[Fe0.3Co0.7(CN)6] and Fe[Fe0.8Co0.2(CN)6] is presented in detail. For both potassium containing compounds the disorder in the potassium arrangement is the most obvious characteristic.

Single-crystal structure determination of LaNi5–xInx and LaNi9–xIn2+x

2020 ◽  
Vol 75 (6-7) ◽  
pp. 553-557
Author(s):  
Yaroslav Kalychak ◽  
Mariya Dzevenko ◽  
Volodymyr Babizhetskyy ◽  
Marek Daszkiewicz ◽  
Lubomir Gulay
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Single Crystal ◽  
Crystal Structures ◽  
Ternary Compound ◽  
Structure Determination ◽  
Structure Investigation ◽  
Space Group ◽  
X Ray

AbstractThe crystal structures of the solid solution LaNi5–xInx (x = 0.51) and the ternary compound LaNi9–xIn2+x (x = 0.80) have been investigated by single-crystal X-ray data. The LaNi5–xInx phase is isotypic with CaCu5: space group P6/mmm, a = 5.042(2), c = 4.009(1) Å. The crystal structure investigation of LaNi9–xIn2+x (x = 0.80) was performed at T = 295 and 100 K: YNi9In2 type, space group P4/mbm, a = 8.3976(3), c = 5.0439(3) Å for T = 295 K and a = 8.3814(2), c = 5.0352(2) Å for T = 100 K. The lanthanum atoms are located on split positions 2a (0 0 0) and 4e (0 0 0.05).

A study on α-RuCl3 crystal structure by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 30-31
Author(s):  
H.-J. Cantow ◽  
H. Hillebrecht ◽  
S. Magonov ◽  
H. W. Rotter ◽  
G. Thiele
Keyword(s):  
Crystal Structure ◽  
Density Distribution ◽  
Scanning Tunneling Microscopy ◽  
Electron Density ◽  
Structure Determination ◽  
Electron Density Distribution ◽  
Scanning Tunneling ◽  
Monoclinic Space Group ◽  
Tunneling Microscopy ◽  
X Ray

From X-ray analysis, the conclusions are drawn from averaged molecular informations. Thus, limitations are caused when analyzing systems whose symmetry is reduced due to interatomic interactions. In contrast, scanning tunneling microscopy (STM) directly images atomic scale surface electron density distribution, with a resolution up to fractions of Angstrom units. The crucial point is the correlation between the electron density distribution and the localization of individual atoms, which is reasonable in many cases. Thus, the use of STM images for crystal structure determination may be permitted. We tried to apply RuCl3 - a layered material with semiconductive properties - for such STM studies. From the X-ray analysis it has been assumed that α-form of this compound crystallizes in the monoclinic space group C2/m (AICI3 type). The chlorine atoms form an almost undistorted cubic closed package while Ru occupies 2/3 of the octahedral holes in every second layer building up a plane hexagon net (graphite net). Idealizing the arrangement of the chlorines a hexagonal symmetry would be expected. X-ray structure determination of isotypic compounds e.g. IrBr3 leads only to averaged positions of the metal atoms as there exist extended stacking faults of the metal layers.

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