ChemInform Abstract: Rubidium and Cesium Compounds with the Isopolyanion [Ta6O19]8- - Synthesis, Crystal Structures, Thermogravimetric and Vibrational Spectroscopic Analysis of the Oxotantalates A8[Ta6O19]×nH2O (A: Rb, Cs; n = 0, 4, 14).

ChemInform ◽  
2010 ◽  
Vol 33 (7) ◽  
pp. no-no
Author(s):  
Hans Hartl ◽  
Frank Pickhard ◽  
Franziska Emmerling ◽  
Caroline Roehr
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Analysis

Synthesis, crystal structures, spectroscopic analysis and DFT calculations of 2-ethoxy-1-naphtaldehyde and (E)-N-((2-ethoxynaphthalen-1-yl)methylene)-3-methylaniline

2016 ◽  
Vol 1118 ◽  
pp. 194-202 ◽  
Author(s):  
M. Hakkı Yıldırım ◽  
Arzu Özek Yıldırım ◽  
Mustafa Macit ◽  
Ayşen Alaman Ağar ◽  
Hümeyra Paşaoğlu ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Crystal Structures ◽  
Spectroscopic Analysis

scholarly journals The bis(Biphenyl)phosphorus Fragment in Trivalent and Tetravalent P-Environments

Inorganics ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 82
Author(s):  
Jonas Hoffmann ◽  
Daniel Duvinage ◽  
Enno Lork ◽  
Anne Staubitz
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Analysis ◽  
Heteronuclear Nmr ◽  
Ortho Position ◽  
Group 14 ◽  
Reaction Conditions ◽  
Synthetic Routes ◽  
Sterically Hindered

Diaryl substituted phosphorus (III) compounds are commonly used motifs in synthesis. Although the basic synthetic routes to these molecules starting from PCl3 are well reported, sterically hindered aryl substituents can be difficult to introduce, especially if the P atom is in ortho position to another group. This work explores the chemistry of the bis(biphenyl)phosphorus(III) fragment. As third substituents, H, M, Cl, NR2, two group 14 element substituents and also Li were introduced in high-yielding processes offering a wide chemical variety of the bis(biphenyl) phosphine motif. In addition, also a tetravalent phosphine borane adduct was isolated. All structures were thoroughly investigated by heteronuclear NMR spectroscopic analysis. Furthermore, the reaction conditions are discussed in connection with the structures and four crystal structures of the aminophosphine, phosphine, phosphine borane and phosphide are provided. The latter crystallized as a dimer with a unique planar P2Li2 ring, which is stabilized by the non-covalent C⋯Li interaction arising from the biphenyl motif and represents a rare example of a donor-free planar P2Li2 ring.

scholarly journals Single-crystal structures and spectroscopic analysis in metal complex dynamics

2016 ◽  
Vol 72 (a1) ◽  
pp. s388-s388
Author(s):  
Andreas Roodt ◽  
Hendrik G. Visser ◽  
Alice Brink ◽  
Marietjie Schutte-Smith ◽  
Pennie Mokolokolo ◽  
...  
Keyword(s):  
Metal Complex ◽  
Single Crystal ◽  
Crystal Structures ◽  
Spectroscopic Analysis ◽  
Complex Dynamics ◽  
Single Crystal Structures

Squaraines: Crystal Structures and Spectroscopic Analysis of Hydrated and Anhydrous Forms of Squaric Acid-Isoniazid Species

2014 ◽  
Vol 118 (49) ◽  
pp. 11521-11528 ◽  
Author(s):  
Felipe D. dos Reis ◽  
Isabela C. Gatti ◽  
Humberto C. Garcia ◽  
Vanessa E. de Oliveira ◽  
Luiz F. C. de Oliveira
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Analysis ◽  
Squaric Acid

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.

Characterization of Chemical Impurities in Glutaraldehyde

1975 ◽  
Vol 33 ◽  
pp. 620-621
Author(s):  
B. J. Grenon ◽  
A. J. Tousimis
Keyword(s):  
Glutaric Acid ◽  
Spectroscopic Analysis ◽  
Aldol Condensation ◽  
Condensation Product ◽  
Amorphous Solid ◽  
Water Soluble ◽  
Impurity Component ◽  
Chemical Impurities ◽  
Soluble Liquid

Ever since the introduction of glutaraldehyde as a fixative in electron microscopy of biological specimens, the identification of impurities and consequently their effects on biologic ultrastructure have been under investigation. Several reports postulate that the impurities of glutaraldehyde, used as a fixative, are glutaric acid, glutaraldehyde polymer, acrolein and glutaraldoxime.Analysis of commercially available biological or technical grade glutaraldehyde revealed two major impurity components, none of which has been reported. The first compound is a colorless, water-soluble liquid with a boiling point of 42°C at 16 mm. Utilizing Nuclear Magnetic Resonance (NMR) spectroscopic analysis, this compound has been identified to be — dihydro-2-ethoxy 2H-pyran. This impurity component of the glutaraldehyde biological or technical grades has an UV absorption peak at 235nm. The second compound is a white amorphous solid which is insoluble in water and has a melting point of 80-82°C. Initial chemical analysis indicates that this compound is an aldol condensation product(s) of glutaraldehyde.

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