A comparative synthetic and structural study of triphenylmethoxide and triphenylsiloxide complexes of the early lanthanides, including x-ray crystal structures of La2(OCPh3)6 and Ce2(OSiPh3)6

1991 ◽  
Vol 30 (26) ◽  
pp. 4963-4968 ◽  
Author(s):  
William J. Evans ◽  
Robert E. Golden ◽  
Joseph W. Ziller
Keyword(s):  
Crystal Structures ◽  
Structural Study ◽  
X Ray

Structural Study of the Disordered RECd6 Quasicrystal Approximants (RE = Tb, Ho, Er, Tm and Lu)

2006 ◽  
Vol 61 (6) ◽  
pp. 644-649 ◽  
Author(s):  
Shu Ying Piao ◽  
Cesar P. Gömez ◽  
Sven Lidin
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Structural Study ◽  
Diffraction Data ◽  
Unit Cell Dimension ◽  
Unit Cell ◽  
Cell Dimension ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Types

The crystal structures of approximants RECd6 (RE = Tb, Ho, Er, Tm and Lu) have been refined from single crystal X-ray diffraction data. This work is a continuation of a previous study of MCd6 approximants [1] in which the different types of disorder of the central Cd4 tetrahedra located in the dodecahedral cavities were examined. The structures of the title compounds are all similar to GdCd6 and disorder was observed in all these compounds. There is a correlation between the anisotropic displacement parameter and the unit cell dimension

Cisplatin binding to human serum albumin: a structural study

2015 ◽  
Vol 51 (46) ◽  
pp. 9436-9439 ◽  
Author(s):  
Giarita Ferraro ◽  
Lara Massai ◽  
Luigi Messori ◽  
Antonello Merlino
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Crystal Structures ◽  
Structural Study ◽  
X Ray ◽  
X Ray Crystallography ◽  
First Time

The reaction between cisplatin and human serum albumin (HSA) was investigated by X-ray crystallography and crystal structures of the cisplatin/HSA adduct were eventually solved for the first time.

scholarly journals Synthesis and comparative structural study of 2-(pyridin-2-yl)-1H-perimidine and its mono- and di-N-methylated analogues

2021 ◽  
Vol 77 (2) ◽  
pp. 96-100
Author(s):  
Paulina Kalle ◽  
Sergei V. Tatarin ◽  
Alexander Yu. Zakharov ◽  
Marina A. Kiseleva ◽  
Stanislav I. Bezzubov
Keyword(s):  
Nmr Spectroscopy ◽  
Nitrogen Atom ◽  
Single Crystal ◽  
Crystal Structures ◽  
Structural Study ◽  
Molecular Conformation ◽  
X Ray ◽  
Π Interactions ◽  
H Nmr ◽  
Mild Conditions

The title compounds, 2-(pyridin-2-yl)-1H-perimidine (C16H11N3; 1), 1-methyl-2-(pyridin-2-yl)-1H-perimidine (C17H13N3; 2), and 1,3-dimethyl-2-(pyridin-2-yl)-1H-perimidinium iodide (C18H16N3 +·I−; 3) were synthesized under mild conditions and their structures were determined by 1H NMR spectroscopy and single-crystal X-ray analysis. The N-methylation of the nitrogen atom(s) at the perimidine moiety results in a significant increase of the interplane angle between the pyridin-2-yl ring and the perimidine system. The unsubstituted perimidine (1) forms a weak intramolecular N—H...N bond that consolidates the molecular conformation. In the crystal structures of 1–3, the molecular entities all are assembled through π–π and C—H...π interactions.

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.

Crystal Structures of Fragments D and Double-D from Fibrinogen and Fibrin

1999 ◽  
Vol 82 (08) ◽  
pp. 271-276 ◽  
Author(s):  
Glen Spraggon ◽  
Stephen Everse ◽  
Russell Doolittle
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Crystal Structures ◽  
Structure And Function ◽  
X Ray ◽  
Long Period ◽  
And Function

IntroductionAfter a long period of anticipation,1 the last two years have witnessed the first high-resolution x-ray structures of fragments from fibrinogen and fibrin.2-7 The results confirmed many aspects of fibrinogen structure and function that had previously been inferred from electron microscopy and biochemistry and revealed some unexpected features. Several matters have remained stubbornly unsettled, however, and much more work remains to be done. Here, we review several of the most significant findings that have accompanied the new x-ray structures and discuss some of the problems of the fibrinogen-fibrin conversion that remain unresolved. * Abbreviations: GPR—Gly-Pro-Arg-derivatives; GPRPam—Gly-Pro-Arg-Pro-amide; GHRPam—Gly-His-Arg-Pro-amide

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