Studies of the Interaction between the Hexyl Anion and Alkali Metal Ions

Motomizu, Shoji; Tôei, Kyoji; Iwachido, Tadashi

doi:10.1246/bcsj.42.1006

Cited by 46 publications

(21 citation statements)

References 4 publications

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“…Trimethyl sulfonium 9a c are fundamental sulfonium compounds [13], which are ionic and show high solubility not only in water, but also in organic solvent . Sulfonium compounds dissociate into ions and the sulfonium cation forms ion pairs with counter anion [14]. The association constants (K) and lipophilicity of ion pairs are important for absorption of sulfonium compounds.…”

Section: Selection Of Counter Anion Of Sulfonium Compoundmentioning

confidence: 99%

Lead Generation of Anti-allergic Agent ; Suplatast Tosilate

Tada

Yamawaki

Ueda

et al. 2001

CBIJ

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The reaction of transmethylation plays an important role in the immune system. Some kinds of sulfonium compounds, which have a labile methyl group, are considered to become the supply source for methyl groups in biological systems. We examined the physicochemical properties of sulfonium compounds from the point of structure activity relationships analysis in order to develop an antiallergy drug. We found that several sulfonium compounds have immunological activity, and 2-hydroxyethyldimethylsulfonium p-toluenesulfonate (4) was chosen as the lead compound for further studies.

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Section: Selection Of Counter Anion Of Sulfonium Compoundmentioning

confidence: 99%

Lead Generation of Anti-allergic Agent ; Suplatast Tosilate

Tada

Yamawaki

Ueda

et al. 2001

CBIJ

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“…24,[45][46][47][48][49][50][51][52][53] In some cases, accurate numbers of coextracted molecules could be experimentally measured. 24,[49][50][51][52][53] Using nitrobenzene as the organic solvent, the more recent values for the number of coextracted water molecules 24 from Na + to Rb + ranged from 3.8 to 0.7, and a value of 14 ( 2 water molecules coextracted by Ca 2+ was obtained. In the present simulations, the summation of the water molecules dragged into the organic phase in the first and second hydration shells of Sr 2+ is estimated at 13 ( 1.…”

Section: Radial Distributionmentioning

confidence: 99%

Influence of Ion Size and Charge in Ion Transfer Processes Across a Liquid|Liquid Interface

2000

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In this work, molecular dynamics simulations have been used to study the transfer of some alkaline ions (Na + , K + , and Rb + ), an alkaline-earth ion (Sr 2+ ), and an organic ion (N(CH 3 ) 4 + ) across the water/2-heptanone liquid/liquid interface. Potentials of mean force were calculated and the ion transfer mechanisms were analyzed. The computed free energies of transfer exhibit a clear dependence on the ionic size and charge. In clear agreement with the experimental results obtained for several liquid/liquid biphasic systems, the free energies of transfer increase with the ionic charge and decrease with the ionic size. In all cases investigated, the potential of mean force for the transfer shows a monotonic increase in the Gibbs free energy as the ion progresses into the organic liquid. The major increase of the free energy occurs when the ion is on the organic side of the interface. The transfer seems to be an activationless process because there is no free energy barrier, this is true even in the case of the transfer of the organic ion. The transfer mechanism involves the formation of a water finger that connects the ions in the organic phase to the water phase during the transfer in both directions (i.e., from water to the organic phase and vice versa). For the organic and the alkaline ions, the water finger may be as long as 10 Å and, for the alkaline-earth ion, as long as 14 Å. In addition, it has been found that all the ions drag a part of their hydration shell into the organic phase, a phenomenon well documented experimentally. For similar ions, the number of water molecules and the fraction of the hydration shell dragged into the organic phase increased with the robustness of their shell. The N(CH 3 ) 4 + ion drags slightly more water molecules than the alkaline ions, although the fraction of its hydration shell that remains in the organic solvent is much smaller. The mechanisms of the ion transfer processes studied here are all qualitatively similar, showing however a quantitative dependence on the ionic size and charge.

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“…60 Ion-pair solvent extraction could give the ion association constant in aqueous solution, but the reliability was inferior. 79 Katsuta and Takeda utilized transfer activity coefficient for the analysis of ion association reaction, but the method still includes extrapolations or assumptions. 80 Capillary zone electrophoresis can handle the concentration of ion associate as low as 10 -5 M or less, 28 and ion association reactions in an aqueous solution can be directly analyzed through the change in electrophoretic mobility of analytes.…”

Section: ·1 Utilization Of Ion Association Reactions In Cze Separationsmentioning

confidence: 99%

Analysis of Ion-Association Reaction in Aqueous Solution and Its Utilization by Capillary Zone Electrophoresis

Takayanagi

2004

ANAL. SCI.

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Studies of the Interaction between the Hexyl Anion and Alkali Metal Ions

Cited by 46 publications

References 4 publications

Lead Generation of Anti-allergic Agent ; Suplatast Tosilate

Lead Generation of Anti-allergic Agent ; Suplatast Tosilate

Influence of Ion Size and Charge in Ion Transfer Processes Across a Liquid|Liquid Interface

Analysis of Ion-Association Reaction in Aqueous Solution and Its Utilization by Capillary Zone Electrophoresis

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