scholarly journals Correlation of Crystal Parameter with Vibrational Data of New Three Tetramethylammonium Salts

2012 ◽  
Vol 7 (1) ◽  
pp. 61-67 ◽  
Author(s):  
S. GHAMMAMY ◽  
SADJAD SEDAGHAT ◽  
H. SAHEBALZAMANI
Keyword(s):  
Crystal Parameter ◽  
Tetramethylammonium Salts

X-ray diffraction properties of curved crystal diffractors

1992 ◽  
Vol 50 (2) ◽  
pp. 1734-1735
Author(s):  
W. Z. Chang ◽  
D. B. Wittry
Keyword(s):  
Diffraction Theory ◽  
X Rays ◽  
Diffraction Image ◽  
X Ray Diffraction ◽  
Rocking Curve ◽  
X Ray ◽  
Bent Crystal ◽  
Diffraction Geometry ◽  
Crystal Parameter ◽  
Quantitative Procedure

Since Du Mond and Kirkpatrick first discussed the principle of a bent crystal spectrograph in 1930, curved single crystals have been widely utilized as spectrometric monochromators as well as diffractors for focusing x rays diverging from a point. Curved crystal diffraction theory predicts that the diffraction parameters - the rocking curve width w, and the peak reflection coefficient r of curved crystals will certainly deviate from those of their flat form. Due to a lack of curved crystal parameter data in current literature and the need for optimizing the choice of diffraction geometry and crystal materials for various applications, we have continued the investigation of our technique presented at the last conference. In the present abstract, we describe a more rigorous and quantitative procedure for measuring the parameters of curved crystals.The diffraction image of a singly bent crystal under study can be obtained by using the Johann geometry with an x-ray point source.

Benzene-1,2-disulfonate dianion: another compound with meshed cogwheel substituents?

1996 ◽  
Vol 52 (3) ◽  
pp. 562-568 ◽  
Author(s):  
N. Nagel ◽  
P. Eller ◽  
H. Bock
Keyword(s):  
Crystal Structures ◽  
Disulfonic Acid ◽  
Conformational Isomerization ◽  
Tetramethylammonium Salts

Crystal structures of the dipotassium and potassium tetramethylammonium salts of benzene-1,2-disulfonic acid have been determined at 200 K and a PM3 enthalpy hypersurface for the substituent rotations of the free benzene-1,2-disulfonate dianion was calculated. The cogging of the two sulfonate groups as well as the possible pathways of conformational isomerization are discussed and compared with already investigated molecules containing adjacent threefold substituents.

Anion Allosteric Effect in the Recognition of Tetramethylammonium Salts by Calix[4]areneConeConformers

2001 ◽  
Vol 66 (25) ◽  
pp. 8302-8308 ◽  
Author(s):  
Arturo Arduini ◽  
Giovanna Giorgi ◽  
Andrea Pochini ◽  
Andrea Secchi ◽  
Franco Ugozzoli
Keyword(s):  
Allosteric Effect ◽  
Tetramethylammonium Salts

Die Schwingungsspektren von μ-Οxο- und μ-Nitridokomplexen des Rutheniums and Rheniums / Vibrational Spectra of μ-Oxo and µ-Nitrido Complexes of Ruthenium and Rhenium

1975 ◽  
Vol 30 (3-4) ◽  
pp. 210-214 ◽  
Author(s):  
Rainer Mattes ◽  
Mohamed Moumen ◽  
Ingeborg Pernoll
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectra ◽  
Normal Coordinate Analysis ◽  
Force Constants ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Nitrido Complexes ◽  
Tetramethylammonium Salts

The infrared and Raman spectra of potassium and tetramethylammonium salts of the dinuclear anions M2OX104- and M2NX8(H2O)23-, with M=Ru, Re and X=Cl, Br, have been registered and assigned on the basis of a normal coordinate analysis. The totally symmetric vibrations νsΜ2Ο (νsM2N), νsMXa,x(νsM—OH2) and δsOMX (δsNMX) show considerable mixing. The force constants of the bridge bonds are 3.9 mdyn/Å for the μ-oxo-and 5.1 mdyn/Å for the μ-nitrido-compounds, the respective stretch-stretch interaction constants 0.45 and 0.6 mdyn/Å.

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