Synthesis, X-ray crystal structure, and chemistry of the cation [(η-MePh)Mo(µ-SMe)4Mo(η-MePh)]2+; easy D2O–NaOD catalysed H–D exchange of the methyl hydrogens of a η-bonded toluene ligand

1978 ◽  
Vol 0 (23) ◽  
pp. 1009-1011 ◽  
Author(s):  
William E. Silverthorn ◽  
Claire Couldwell ◽  
Keith Prout
Keyword(s):  
Crystal Structure ◽  
X Ray ◽  
Crystal Structure And Chemistry

ChemInform Abstract: Preparation, X-Ray Crystal Structure, and Chemistry of Stable Azidoiodinanes - Derivatives of Benziodoxole.

ChemInform ◽  
2010 ◽  
Vol 27 (38) ◽  
pp. no-no
Author(s):  
V. V. ZHDANKIN ◽  
A. P. KRASUTSKY ◽  
C. J. KUEHL ◽  
A. J. SIMONSEN ◽  
J. K. WOODWARD ◽  
...  
Keyword(s):  
Crystal Structure ◽  
X Ray ◽  
Derivatives Of ◽  
Crystal Structure And Chemistry

Crystal structure and chemistry of natural kutinaite from Černý Důl, Krkonoše, Czech Republic

2015 ◽  
Vol 79 (5) ◽  
pp. 1099-1109 ◽  
Author(s):  
Luca Bindi ◽  
Emil Makovicky
Keyword(s):  
Crystal Structure ◽  
Czech Republic ◽  
Metal Contacts ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters ◽  
Metal Metal ◽  
Crystal Structure And Chemistry

AbstractWe have characterized the crystal structure of natural kutinaite, a rare mineral from the ores of Černý Důl, Czech Republic, by single-crystal X-ray diffraction and chemical analysis. We found that the structure of natural kutinaite is not identical to that of synthetic Cu14Ag6As7, previously reported to be cubic, space group Pm3m. Although topologically similar, the structure of natural kutinaite is indeed tetragonal, space group P4/mmm, with cell parameters: a = 11.789(2), c = 11.766(2) Å, V = 1635.5(4) Å3 and Z = 4. Electron microprobe analyses pointed to the (K,Tl)0.25Cu14Ag6As6.75 stoichiometry (Z = 4), or (K, Tl)Cu56Ag24As27 with Z = 16. The crystal structure of an untwinned crystal has been refined to R1 = 2.61%. It consists of clusters of eight edge-sharing tetrahedra of Cu, which alternate in a 3D chess-board manner with octahedral clusters of six Ag atoms. The latter are surrounded by triangularly coordinated copper in eight faces of a cuboctahedron. The last structure components are large cavities containing partly occupied (K,Tl) sites, coordinated by 18 Ag and As ligands. The structure is full of direct metal-metal contacts although As plays the role of anion, associating especially with copper.

The crystal structure and chemistry of the "red salt" α-trisilver-amidoselenate, Ag3NSeO3

1990 ◽  
Vol 68 (9) ◽  
pp. 1606-1610 ◽  
Author(s):  
Vladimir Kocman ◽  
Jan T. Szymański
Keyword(s):  
Crystal Structure ◽  
Structural Unit ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Threefold Axis ◽  
X Ray ◽  
Dimensional Network ◽  
Crystal Structure And Chemistry ◽  
Silver Atoms ◽  
Nitrogen Bond

The crystal structure of the α-modification of the "red salt" of trisilver amidoselenate, Ag3NSeO3 has been determined from MoKα X-ray diffraction data, and refined to R = 3.19% from 337 unique absorption-corrected observed reflections. The structure is rhombohedral, R3c (No. 161), with (hexagonal) a = 8.462(4), c = 11.372(6) Å. The formula unit has point symmetry 3 (C3), with Se and N on the threefold axis, each approximately tetrahedrally coordinated; Se by three oxygen atoms (at 1.651(8) Å and N (at 1.70(2) Å, and N by Se and three silver atoms (at 2.164(8) Å. The bond of 1.70(2) Å between Se and N is particularly short. The Ag3NSeO3 structural unit bridges to three adjacent units via short Ag … O contacts of 2.23(1) Å to form a three-dimensional network. Keywords: trisilver amidoselenate, selenium–nitrogen bond, X-ray structure.

Preparation, X-ray Crystal Structure, and Chemistry of Stable AzidoiodinanesDerivatives of Benziodoxole

1996 ◽  
Vol 118 (22) ◽  
pp. 5192-5197 ◽  
Author(s):  
Viktor V. Zhdankin ◽  
Alexei P. Krasutsky ◽  
Chris J. Kuehl ◽  
Angela J. Simonsen ◽  
Jessica K. Woodward ◽  
...  
Keyword(s):  
Crystal Structure ◽  
X Ray ◽  
Crystal Structure And Chemistry

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.

X-ray Crystal Structure of ?9-THC-tosylate

Planta Medica ◽  
2008 ◽  
Vol 74 (03) ◽  
Author(s):  
W Gul ◽  
P Carvalho ◽  
D Slade ◽  
M Avery ◽  
JR Duchek ◽  
...  
Keyword(s):  
Crystal Structure ◽  
X Ray
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