Copper(II) benzoate dimers coordinated by different linear alcohols – A systematic study of crystal structures

2014 ◽  
Vol 1064 ◽  
pp. 122-129 ◽  
Author(s):  
Felix Katzsch ◽  
Alexander S. Münch ◽  
Florian O.R.L. Mertens ◽  
Edwin Weber
Keyword(s):  
Crystal Structures ◽  
Systematic Study ◽  
Linear Alcohols

A Systematic Study on Iron Carbides from First-Principles

2010 ◽  
Vol 654-656 ◽  
pp. 47-50 ◽  
Author(s):  
In Gee Kim ◽  
Gul Rahman ◽  
Jae Hoon Jang ◽  
You Young Song ◽  
Seung Woo Seo ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Systematic Study ◽  
First Principles ◽  
Formation Enthalpy ◽  
The Other ◽  
Iron Carbides ◽  
Ratio Dependence ◽  
Critical Concentrations

The formation enthalpy of a series of Fe-C carbides has been estimated using a first-principles approach. The Fe to C ratio dependence of the formation enthalpy is reasonable, but it is revealed that - and -carbides require an extraordinary environment to be able to form. Furthermore, an addition of substitutional solutes other than Fe and C should promote other carbides with different crystal structures. The analysis suggests further studies to discover the critical concentrations of alloying which stimulate the other carbides to become more stable.

The formation of paracetamol (acetaminophen) adducts with hydrogen-bond acceptors

2002 ◽  
Vol 58 (6) ◽  
pp. 1057-1066 ◽  
Author(s):  
Iain D. H. Oswald ◽  
David R. Allan ◽  
Pamela A. McGregor ◽  
W. D. Samuel Motherwell ◽  
Simon Parsons ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Crystal Structures ◽  
Systematic Study ◽  
Guest Molecule ◽  
Guest Molecules ◽  
Oh Groups ◽  
Stacking Interaction ◽  
Hydrogen Bond Interactions ◽  
Π Stacking Interaction ◽  
Graph Set

The crystal structures of five hemiadducts of paracetamol with 1,4-dioxane, N-methylmorpholine, morpholine, N,N-dimethylpiperazine and piperazine and a related 1:1 adduct of paracetamol with 4,4′-bipyridine are described. All structures are characterized by the formation of chains of paracetamol molecules, which are linked via either OH...O=C interactions [C(9) chains in graph-set notation] or NH...O=C interactions [C(4) chains], depending on the presence or absence of substituent groups on the guest molecule. In all cases except for the morpholine and bipyridine adducts these chains are connected by hydrogen-bond interactions with the guest molecules, which reside on crystallographic inversion centres. In the bipyridine adduct this linkage also involves a π-stacking interaction; in the morpholine adduct it is formed between the OH groups of two opposed paracetamol molecules. Most adducts (that with 4,4′-bipyridine is an exception) decompose on heating to give monoclinic paracetamol. This is the first systematic study of a series of co-crystals containing paracetamol.

Systematic Study on Crystal Structures in Tetragonal RB2C2 (R=Rare Earth) Compounds

2001 ◽  
Vol 70 (11) ◽  
pp. 3291-3295 ◽  
Author(s):  
Kenji Ohoyama ◽  
Koji Kaneko ◽  
Kentaro Indoh ◽  
Hiroki Yamauchi ◽  
Aya Tobo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Crystal Structures ◽  
Systematic Study ◽  
Rare Earth Compounds

1. A long history

2016 ◽  
pp. 1-23
Author(s):  
A. M. Glazer
Keyword(s):  
Crystal Structures ◽  
19Th Century ◽  
Systematic Study ◽  
17Th Century ◽  
X Ray Diffraction ◽  
Robert Hooke ◽  
New Era ◽  
Space Groups ◽  
Johannes Kepler ◽  
The 19Th Century

‘A long history’ explains that it was during the 17th-century Enlightenment that saw the systematic study of crystals or ‘crystallography’ by key scientists including Johannes Kepler, Robert Hooke, Christian Huygens, Nicolas Steno, and Abbé René-Just Haüy—the true father of crystallography, who postulated that crystals must be made up of regular arrangements of polyhedral units. The 19th century saw new theories of crystals with the identification of thirty-two crystal classes, fourteen Bravais lattices, and 230 possible space groups. A new era of crystallography emerged with the discovery of X-ray diffraction by crystals by Max Theodor Felix Laue. William Henry Bragg and his son William Lawrence Bragg went on to identify many crystal structures.

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