Alkylammonium Halides Research Articles

Some aspects of ion-exchange chromatography employing adsobed ion exchangers on reversed-phase columns

The nature of the retention of ionic solutes in the presence of alkyl sulphonates and quaternary alkylammonium halides is examined, and it is shown that the ion-exchange reagents adsorbed on the hydrocarbon stationary phase and act as adsorbed ion-exchange agents. Thus, in the system examined the major mechanism of retention is normal ion-exchange chromatography. This paper demonstrates that a layer of solvent exists over the surface of the bonded phase which can be shown by the nature of the adsorption isotherm of methanol on the bonded phase; this is also confirmed chromatographically. In a similar manner, the adsorption isotherm of sodium octane sulphonate is also determined, and the presence of the adsorbed layer of the octane sulphonate confirmed by chromatographic measurements. By the use of conductivity and nuclear magnetic resonance chemical shift measurements, it is shown that in the system examined and under the conditions where solutes are retained by an ion-exchange mechanism on the surface of the stationary phase, both solute and ion-exchange reagent are ionized.

Infrared Spectrometric Study of the Interaction Between Tetraalkylammonium - or Trialkylammonium Halides and Some Phenol Derivatives. III Far Infrared Spectrum (200 - 50 cm−1)

Several authors have described the interaction of ion pairs such as alkylammonium halides with proton donor molecules in aprotic organic solvents sing NMR1,2, mid-infrared 2-6 or electronic spectro...

Quadrupole resonance studies of hydrogen bonding in alkylammonium halides under high pressure

The temperature and pressure dependence of the 79Br and 127I quadrupole resonance frequencies have been studied in the salts [MeNH3]+Br–, [MeNH3]+I–, [EtNH3]+Br–, and [EtNH3]+I–, and their N-deuterated derivatives. The observed pressure coefficients of the quadrupole coupling constant can be large, as much as 11 kHz (MPa)–1 for 127I resonance in [MeNH3]+I–. The effects of rise in temperature and deuteration are explained mainly in terms of an anisotropic expansion of the hydrogen bonds between the cation and the bromide or iodide ions; pressure appears both to compress the hydrogen bonds and to change their angular configuration at the halide ion.

Conductometric Behaviour of Trimethyl Alkyl and Trimethyl Aryl Ammonium Halides in Aqueous and Nonaqueous Solutions at 25°C

Conductometric Behaviour of Trimethyl Alkyl and Trimethyl Aryl Ammonium Halides in Aqueous and Nonaqueous Solutions at 25°C

Model calculations for Setchenow coefficients

The calculations of Setchenow coefficients reported earlier [H. L. Friedman, C. V. Krishnan, and C. Jolicoeur,Ann. N.Y. Acad. Sci. 204, 79 (1973)] have been extended to aqueous solutions of various nonelectrolytes mixed with alkali or alkylammonium halides. A few data for Setchenow coefficients in methanol have also been treated. The GurneyA ij parameters for nonelectrolyte-ion interactions in models which fit the data are mostly negative, and more so the larger the solute molecules. A value ofA ij near-100 cal-mole−1 seems to characterize hydrophobic bonding. In several systems these is evidence that some nonsolvation contribution to theu ij pair potential which is not explicitly accounted for in the models is important in the real systems. Quite possibly this contribution is due to dispersion forces or to the chargepolarizability interaction. On the whole, theA ij parameters do not seem to depend upon the charges on solute particlesi andj; this is evidence that the model is fairly realistic.

Apparent and Partial Molal Volumes of Trimethyl Alkyl and Trimethyl Aryl Ammonium Halides in Aqueous Solutions from 15°C to 45°C

Article Apparent and Partial Molal Volumes of Trimethyl Alkyl and Trimethyl Aryl Ammonium Halides in Aqueous Solutions from 15°C to 45°C was published on May 1, 1974 in the journal Zeitschrift für Physikalische Chemie (volume 90, issue 1_2).

Transition Behavior of Alkylammonium Halides

Transition behavior of alkylammonium halides was investigated by means of DTA, IR spectrum, X-ray diffraction, dielectric constant and microscopic observation. Dodecylammonium chloride (DAC) had three transition points A (45°C), B (58°C) and C (69°C). B and C were reversible, but A was not found on the first heating step.DAC seems to have the thermal behavior as follows. At the first transition point A, DAC dissociated into dodecylamine (DA) and free hydrochloride, and the complex is produced between DA and DAC at B. The crystal structure of this complex, which is monoclinic, changes into other structure at C.On the first heating step, the dissociation seems to be occurred at B. In the case of dodecyl-ammonium bromide and dodecylammonium iodide, A was already found on the first heating step.

The single polarization impulse (spi) method of formation-emf measurements

To measure the emf of cells containing metal and halogen electrodes in solutions of metal halides in fused organic salts, conventional halogen electrodes cannot be used because of reaction of the halogen with the organic salts. Consequently a method has been developed wherein the halogen is momentarily generated at unit activity by a single polarization impulse within the cell itself.The theory of the method is developed, and experiments with silver halides in alkylammonium halides demonstrate its validity.

X-ray study of primary long chain alkylammonium halides

Primary normal alkylammonium halides crystallize in a preferred crystallographic orientation, forming single or twinned layers. The basal spacings are related to the number of carbon atoms within the homologous series, and are doubled in the twin layers. The orientation of the hydrocarbon chains between the ionic heads is discussed.

Factors relating to the formation of N-alkyl- B-halogenoborazines

The formation of N-alkyl- B-halogenoborazines from alkylammonium halide and boron trihalide (R = Me, Et, Pr n , Pr i , Bu n , Bu s , Oct. n but not Bu t ), entails the immediate formation of the tetrahalogenoborate, RNH 3 +BX 4 −, followed by the 1:1 complex, RNH 2BX 3, ill-defined further intermediates, and then the borazine according to the b.p. of the solvent used. Residues indicated further polymerisation; but were not investigated beyond chemical analysis. The t-butyl system gave the compound, Bu t NHBCl 2; but not the borazine. In the presence triethylamine, the amine systems, except the Bu t one, still gave the borazine, whereas the B t system afforded the borazocine (Bu t NBCl) 4.

Polarography of zirconium and hafnium in acetonitrile

Data on the polarographic behaviour of zirconium and hafnium tetrachlorides in acetonitrile, in electrolytes of tetra alkylammonium perchlorate and halide are presented. The stepwise reduction of these metal ions to M (III), M (II), and M (O) is proposed and supported by the polarographic data.

Reaction of Dimethyl Ether-Boron Trifluoride with Quaternary Alkyl Ammonium Halides

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of Dimethyl Ether-Boron Trifluoride with Quaternary Alkyl Ammonium HalidesCharles M. Wheeler Jr. and Richard A. SandstedtCite this: J. Am. Chem. Soc. 1955, 77, 7, 2024–2025Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://doi.org/10.1021/ja01612a102RIGHTS & PERMISSIONSArticle Views111Altmetric-Citations10LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (313 KB) Get e-Alerts Get e-Alerts

Molecular Rotation in the Solid State

THE determined crystal structures of a number of primary alkyl ammonium halides indicate that in such compounds the carbon atoms are arranged collinearly1 in a particular group. Thus in the case of primary amyl ammonium chloride2 the X-ray diffraction data from powders and single crystals can be completely explained by a tetragonal unit of structure containing 2NH3C5H11Cl with a = b = 5.01 A., c = 16.69 A. The space group is D42, Vd3, S41, C4v1 C41 D4h7, and the CI, N and C atoms are at o½u, ½oū, with ucl = c. 0.095. The absence of reflections in odd orders from planes (hkO) with (h + k) odd and the intensities of reflections from other planes such as (200) require the carbon atoms of the C5H11 groups to scatter X-radiation as if they are arranged collinearly in each group.