Solubilization of some tetramethylammonium salts and of ethyltrimethylammonium bromide by their homologues in chloroform

1989 ◽  
Vol 85 (9) ◽  
pp. 2669 ◽  
Author(s):  
Jan Czapkiewicz
Keyword(s):  
Tetramethylammonium Salts

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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