ChemInform Abstract: Syntheses, Crystal Structures, and Energetics of a Complete Series of Lithium Salts of Binary or Ternary Hexachalcogenodistannates(IV), Li4Sn2E6×8en (E: S, Se, Te), Li4Sn2S1.36Se4.64×8en, Li4Sn2Se2Te4×8en, Li4Sn2Se2Te4×9en, and Li4Sn2

ChemInform ◽  
2010 ◽  
Vol 33 (15) ◽  
pp. no-no
Author(s):  
Stefanie Dehnen ◽  
Christian Zimmermann ◽  
Christopher E. Anson
Keyword(s):  
Crystal Structures ◽  
Lithium Salts ◽  
Complete Series

Synthesis and Crystal Structures of Lithium Salts of New Iminophosphide/Phosphinoamide Anions

1997 ◽  
Vol 36 (18) ◽  
pp. 4087-4093 ◽  
Author(s):  
Norbert Poetschke ◽  
Martin Nieger ◽  
Masood A. Khan ◽  
Edgar Niecke ◽  
Michael T. Ashby
Keyword(s):  
Crystal Structures ◽  
Lithium Salts

Von Fluorsilylamiden zu Element-Silylamiden und Iminosilanen

2003 ◽  
Vol 58 (4) ◽  
pp. 246-256
Author(s):  
Michael Jendras ◽  
Uwe Klingebiel ◽  
Mathias Noltemeyer
Keyword(s):  
Crystal Structures ◽  
Nmr Spectra ◽  
Lithium Salt ◽  
Molar Ratio ◽  
Lithium Salts ◽  
Analogous Reaction ◽  
Tert Butyl

Ethyltrifluorosilane reacts with tert-butyllithium in a molar ratio 1:2 to give Et(CMe3)2SiF (1), which forms the aminosilane, Et(CMe3)2SiNH2 (2) in the reaction with NaNH2. The lithium salt of 2 and (Me3C)2SiF2 gives (Me3C)2SiF-NHSi(CMe3)2Et (3). 3 reacts with BuLi to give the lithium salt, (Me3C)2 SiF-NLi-Si(CMe3)2Et (4). tert-Butyl-(di-tert-butylfluoro)-silylaminoalanes (Me3C)2SiF-NCMe3-AlR2, R = Me (5), Et (6) are formed in the reaction of (Me3C)2SiF-NLi CMe3 (I) and ClAlR2. The lithium salt (Me3C)2SiF-NLi-Si(CMe3)2Me (III) reacts with BF3 under formation of the bis(silyl)aminodifluoroborane (Me3C)2SiF-N(BF2) Si(CMe3)2Me (7). In the reaction of I with F3SiPh rotamers of (Me3C)2SiF-NCMe3 SiF2Ph (8) are obtained. Stannyl-silylamines are prepared in reactions of the lithium salts (Me3C)2SiF-NLiR, R = CMe3 (I), SiF(CMe3)2 (II); Si(CMe3)2Me (III) and the chlorostannanes ClSnMe3 (9,10,11) and Cl2SnPh2 (12), (Me3C)2SiF-NSnMe3-Si(CMe3)2R (9: R = F, 10: R = Me), (Me3C)2SiF-NSnMe3CMe3 (11), (Me3C)2SiF-NCMe3SnClPh2 (12). The NMR spectra of 9 and 10 prove the existence of rotamers. The reaction of III with Me3SiOSO2 CF3 in n-hexane leads to the formation of the tris(silyl)amine 13, (Me3C)SiF-NSiMe3)2Si(CMe3)2Me. However, the analogous reaction of III and 4 with Me3SiOSO2CF3 in thf leads to the formation of the stable iminosilanes 14 and 15, (Me3C)2Si==N- Si(CMe3)R, R = Me (14), Et (15) crystal structures of 7 and 12 are presented.

Synthesis of the hexaphenoxotungstate(V) ion; The x-ray crystal structures of the tetraethylammonium and lithium salts

Polyhedron ◽  
1982 ◽  
Vol 1 (7-8) ◽  
pp. 641-646 ◽  
Author(s):  
J.Iwan Davies ◽  
John F. Gibson ◽  
Andrzej C. Skapski ◽  
Geoffrey Wilkinson ◽  
Wong Wai-Kwok
Keyword(s):  
Crystal Structures ◽  
Lithium Salts ◽  
X Ray

Crystal Structures of the Supramolecular Aggregates of the Methyl and Chloro Substituted Gallanes MexGaCl3-x

2004 ◽  
Vol 59 (2) ◽  
pp. 140-147 ◽  
Author(s):  
Christian Lustig ◽  
Norbert W Mitzel
Keyword(s):  
Crystal Structures ◽  
General Formula ◽  
Complete Series ◽  
Supramolecular Aggregates

The crystal structures of the complete series of compounds of the general formula MexGaCl3−x have been determined. New polymorphs of GaCl3 and MeGaCl2 were found. All chloro compounds MexGaCl3−x (x = 0, 1, 2) are dimers with Ga2Cl2 four-membered rings. (GaCl3)2 and (MeGaCl2)2 are aggregated into layers with the same aggregation motif (each molecule connected to four neighbouring molecules), (Me2GaCl)2 is associated in a ladder-like structure (each molecule connected to two neighbouring molecules), GaMe3 forms weakly Ga···C bound pseudo-tetramers aggregated into layers by further Ga···C contacts (each molecule has two shorter Ga···C’ and C···Ga’ and two weaker Ga···C’ and C···Ga’ contacts).

Pollutant Identification by Selected Area Electron Diffraction

1974 ◽  
Vol 32 ◽  
pp. 532-533
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson ◽  
C. W. Walker
Keyword(s):  
Thermal Treatment ◽  
Electron Diffraction ◽  
Sample Preparation ◽  
Crystal Structures ◽  
Water Samples ◽  
Environmental Samples ◽  
Short Review ◽  
Selected Area Electron Diffraction ◽  
Multiple Component

Selected area electron diffraction (SAD) has been used successfully to determine crystal structures, identify traces of minerals in rocks, and characterize the phases formed during thermal treatment of micron-sized particles. There is an increased interest in the method because it has the potential capability of identifying micron-sized pollutants in air and water samples. This paper is a short review of the theory behind SAD and a discussion of the sample preparation employed for the analysis of multiple component environmental samples.

The Imaging of Crystal Structures and Crystal Defects

1978 ◽  
Vol 36 (3) ◽  
pp. 207-217
Author(s):  
J.M. Cowley
Keyword(s):  
Electron Microscope ◽  
Crystal Structures ◽  
Phase Contrast ◽  
Crystal Defects ◽  
Atom Density ◽  
Lack Of Information ◽  
Spatial Frequencies

The problem of "understandinq" electron microscope imaqes becomes more acute as the resolution is improved. The naive interpretation of an imaqe as representinq the projection of an atom density becomes less and less appropriate. We are increasinqly forced to face the complexities of coherent imaqinq of what are essentially phase objects. Most electron microscopists are now aware that, for very thin weakly scatterinq objects such as thin unstained bioloqical specimens, hiqh resolution imaqes are best obtained near the optimum defocus, as prescribed by Scherzer, where the phase contrast imaqe qives a qood representation of the projected potential, apart from a lack of information on the lower spatial frequencies. But phase contrast imaqinq is never simple except in idealized limitinq cases.

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.

Advancing the use of Voronoi–Dirichlet polyhedra to describe interactions in organic molecular crystal structures by the example of galunisertib polymorphs

CrystEngComm ◽  
2021 ◽  
Author(s):  
Viktor N. Serezhkin ◽  
Anton V. Savchenkov
Keyword(s):  
Crystal Structures ◽  
Molecular Crystal ◽  
Noncovalent Interactions ◽  
Organic Molecular Crystal ◽  
Universal Approach ◽  
Structure Properties

The universal approach for studying structure/properties relationships shows that every polymorph of galunisertib is characterized with unique noncovalent interactions.

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