ChemInform Abstract: Synthesis and Crystal Structures of Novel Macrocyclic Compounds and Their Inclusion Phenomenon.

ChemInform ◽  
2010 ◽  
Vol 30 (50) ◽  
pp. no-no
Author(s):  
Hirohiko Houjou ◽  
Kazuhisa Hiratani ◽  
Yoshinobu Nagawa ◽  
Midori Goto
Keyword(s):  
Crystal Structures ◽  
Macrocyclic Compounds ◽  
Inclusion Phenomenon

Synthesis and crystal structures of novel macrocyclic compounds and their inclusion phenomenon

1999 ◽  
Vol 40 (36) ◽  
pp. 6639-6642 ◽  
Author(s):  
Hirohiko Houjou ◽  
Kazuhisa Hiratani ◽  
Yoshinobu Nagawa ◽  
Midori Goto
Keyword(s):  
Crystal Structures ◽  
Macrocyclic Compounds ◽  
Inclusion Phenomenon

Characterization and crystal structures of new Schiff base macrocyclic compounds

2015 ◽  
Vol 56 (7) ◽  
pp. 1410-1414 ◽  
Author(s):  
A. D. Khalaji ◽  
S. Hafez Ghoran ◽  
M. Pojarová ◽  
M. Dušek
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Macrocyclic Compounds

A new method of syntheses of 18-membered macrocyclic diphenyltin(IV) compounds and crystal structures of {Ph2Sn[S(C6H3NO)O]}3·Y (Y = 2H2O or 4C6H6) and {Ph3Sn[S(C6H3NO)O]SnPh3(EtOH)}·[EtOH]

2004 ◽  
Vol 82 (5) ◽  
pp. 608-615 ◽  
Author(s):  
Chunlin Ma ◽  
Qin Jiang ◽  
Rufen Zhang
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
New Method ◽  
Macrocyclic Compounds ◽  
X Ray ◽  
Stacking Interaction ◽  
Π Stacking ◽  
Triphenyltin Chloride ◽  
Π Stacking Interaction ◽  
Solvent Molecules

Two diphenyltin(IV) compounds: {Ph2Sn[S(C6H3NO)O]}3·Y (Y = 2H2O, 1; 4C6H6, 2) have been unexpectedly obtained by the reactions of triphenyltin chloride with 2-mercaptonicotinic acid in the presence of Et3N. However, by the reaction of the same reactants in the presence of EtONa, only a new triphenyltin(IV) compound ({Ph3Sn[S(C6H3NO)O]SnPh3(EtOH)}·[EtOH], 3) was obtained. The X-ray analyses reveal that compounds 1 and 2 are trinuclear, 18-membered macrocyclic compounds while 3 is a dinuclear compound. Specially, π-π stacking interaction was recognized in crystals of compound 1, which makes it a dimer. Co-crystallization was found in the crystals of all the three compounds 1, 2, and 3, the co-crystallized solvent molecules are water, benzene, and ethanol molecules, respectively. A possible dephenylation mechanism of 1 and 2 was illustrated in detail.Key words: triphenyltin, 2-mercaptonicotinic acid, dephenylation, macrocyclic, π-π stacking interaction, co-crystallization, crystal structure.

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.

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