Diphosphine-Stabilized Small Gold Nanoclusters: From Crystal Structure Determination to Ligation-Driven Symmetry Breaking and Anion Exchange Properties

2016 ◽  
Vol 138 (48) ◽  
pp. 15736-15742 ◽  
Author(s):  
Liao-Yuan Yao ◽  
Vivian Wing-Wah Yam
Keyword(s):  
Crystal Structure ◽  
Symmetry Breaking ◽  
Anion Exchange ◽  
Structure Determination ◽  
Gold Nanoclusters ◽  
Crystal Structure Determination ◽  
Exchange Properties

Armstrongite from Khan Bogdo (Mongolia): Crystal structure determination and implications for zeolite-like cation exchange properties

2014 ◽  
Vol 99 (11-12) ◽  
pp. 2424-2432 ◽  
Author(s):  
E. Mesto ◽  
E. Kaneva ◽  
E. Schingaro ◽  
N. Vladykin ◽  
M. Lacalamita ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Cation Exchange ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Exchange Properties

Crystal Structure Determination of Glycerol-Containing Lipids from Electron Diffraction Data. Use of Analog Compounds Based upon Configurational Isomers of Cyclopentane-1, 2, 3-TRIOL

1977 ◽  
Vol 35 ◽  
pp. 24-25
Author(s):  
Douglas L. Dorset ◽  
Anthony J. Hancock
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Diffraction Data ◽  
Structure Determination ◽  
Crystal Surface ◽  
Coherent Scattering ◽  
Crystal Structure Determination ◽  
Electron Diffraction Data ◽  
Polar Group ◽  
Axis Orientation

Lipids containing long polymethylene chains were among the first compounds subjected to electron diffraction structure analysis. It was only recently realized, however, that various distortions of thin lipid microcrystal plates, e.g. bends, polar group and methyl end plane disorders, etc. (1-3), restrict coherent scattering to the methylene subcell alone, particularly if undistorted molecular layers have well-defined end planes. Thus, ab initio crystal structure determination on a given single uncharacterized natural lipid using electron diffraction data can only hope to identify the subcell packing and the chain axis orientation with respect to the crystal surface. In lipids based on glycerol, for example, conformations of long chains and polar groups about the C-C bonds of this moiety still would remain unknown.One possible means of surmounting this difficulty is to investigate structural analogs of the material of interest in conjunction with the natural compound itself. Suitable analogs to the glycerol lipids are compounds based on the three configurational isomers of cyclopentane-1,2,3-triol shown in Fig. 1, in which three rotameric forms of the natural glycerol derivatives are fixed by the ring structure (4-7).

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