Crystal Structure of a Helix Layered Silicate Containing Tetramethylammonium Ions in Sodalite-Like Cages

2001 ◽  
Vol 13 (4) ◽  
pp. 1286-1295 ◽  
Author(s):  
T. Ikeda ◽  
Y. Akiyama ◽  
F. Izumi ◽  
Y. Kiyozumi ◽  
F. Mizukami ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Layered Silicate

scholarly journals Crystal Structure of Nylon 6/Inorganic Layered Silicate Nanocomposite Film.

2000 ◽  
Vol 57 (7) ◽  
pp. 433-439 ◽  
Author(s):  
Koji FUJIMOTO ◽  
Masaki YOSHIKAWA ◽  
Shinichiro KATAHIRA ◽  
Kenji YASUE
Keyword(s):  
Crystal Structure ◽  
Nanocomposite Film ◽  
Layered Silicate ◽  
Nylon 6

scholarly journals Crystal Structure of a Helix Layered Silicate Containing Tetramethyl-ammonium Ions in Sodalite-Like Cages

2003 ◽  
Vol 15 (24) ◽  
pp. 4698-4698
Author(s):  
T. Ikeda ◽  
Y. Akiyama ◽  
F. Izumi ◽  
Y. Kiyozumi ◽  
F. Mizukami ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Layered Silicate ◽  
Ammonium Ions ◽  
Tetramethyl Ammonium

Synthesis and Crystal Structure of a Layered Silicate HUS-1 with a Halved Sodalite-Cage Topology

2011 ◽  
Vol 50 (6) ◽  
pp. 2294-2301 ◽  
Author(s):  
Takuji Ikeda ◽  
Yasunori Oumi ◽  
Koutaro Honda ◽  
Tsuneji Sano ◽  
Koichi Momma ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Layered Silicate ◽  
Synthesis And Crystal Structure

Molybdophyllite: crystal chemistry, crystal structure, OD character and modular relationships with britvinite

2012 ◽  
Vol 76 (3) ◽  
pp. 493-516 ◽  
Author(s):  
U. Kolitsch ◽  
S. Merlino ◽  
D. Holtstam
Keyword(s):  
Crystal Structure ◽  
Layered Silicate ◽  
Chemical Study ◽  
Spectroscopic Studies ◽  
Sensu Stricto ◽  
Crystal Chemical ◽  
X Ray Diffraction ◽  
Space Group ◽  
Raman Spectroscopic ◽  
Ir And Raman

AbstractA detailed crystal-chemical study of the complex layered silicate molybdophyllite was conducted using single-crystal X-ray diffraction (XRD) methods, supplemented by powder XRD, infrared (IR) and Raman spectroscopic studies, chemical analyses by energy-dispersive spectrometry (EDS) on a scanning electron microscope (SEM), and electron probe microanalysis (EPMA). The results, based on several samples from both Långban and Harstigen, Filipstad, Sweden, show that the crystal structure of molybdophyllite has an order-disorder (OD) character. The latter is especially evident in specimens from Långban which display a complex diffraction pattern characterized by the simultaneous presence of sharp spots, diffuse reflections and continuous streaks. The sharp reflections define the unit cell of the family structure (a = 3.124, c = 41.832 Å, space group R32). Two main polytypes (maximum degree of order structures) are indicated by the OD approach: a trigonal one and a monoclinic one; the latter polytype is the most common in the samples that were studied and has space group C2, with a = 16.232(6), b = 9.373(2), c = 14.060(3) Å, b = 97.36(4)º and V = 2121.5(10) Å3.The crystal structure determination [R1= 0.096], together with the EPMA, IR and Raman data, reveal that molybdophyllite is built up by a regular alternation of complex layers with a composition {Mg9[Si10O28(OH)8][OPb4]2}6+and simple layers with a composition [(CO3)3·H2O]6–, leading to the ideal crystal-chemical formula Pb8Mg9[Si10O28(OH)8|O2|(CO3)3]·H2O (Z = 2).This contribution is mainly devoted to the results obtained for molybdophyllite sensu stricto, but new data for britvinite [i.e. 'molybdophyllite-18 Å'] are also presented and its modular relationship with molybdophyllite is discussed.

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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