UV–visible, 1H and 13C NMR spectroscopic studies on the interaction between protons or alkaline earth metal ions and the benzoate ion in acetonitrile

Hojo, Masashi; Ueda, Tadaharu; Ike, Michitaka; Kobayashi, Masato; Nakai, Hiromi

doi:10.1016/j.molliq.2008.06.004

Cited by 15 publications

(8 citation statements)

References 45 publications

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“…1E), a trend also seen in the literature. 64,65 The shi downeld at higher MgBr 2 concentrations likely stems from greater electron withdrawal by Mg 2+ coordinating to the carboxylate group, causing the protons to become deshielded. 13 C NMR chemical shis also change as a function of MgBr 2 concentration, moving either upeld or downeld depending on the carbon atom identity (Fig.…”

Section: Effect Of Magnesium Cations On Product Distributionmentioning

confidence: 99%

Suppressing carboxylate nucleophilicity with inorganic salts enables selective electrocarboxylation without sacrificial anodes

et al. 2021

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Section: Effect Of Magnesium Cations On Product Distributionmentioning

confidence: 99%

Suppressing carboxylate nucleophilicity with inorganic salts enables selective electrocarboxylation without sacrificial anodes

et al. 2021

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“…As a kind of hard base, Bz − can easily adsorb on the surface of magnesium alloy, where is rich in Mg 2+ (hard acid) and form a monolayer adsorption on the surface of magnesium alloy [48]. The monolayer adsorption of Bz − leads to the increase of surface resistance and the decrease of current density of the PEO process subsequently.…”

Section: Working Mechanism Of Nabz Additivementioning

confidence: 99%

Environmental friendly anodizing of AZ91D magnesium alloy in alkaline borate–benzoate electrolyte

Liu

Wei

Yang

et al. 2011

Journal of Alloys and Compounds

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“…In poor solvating media such as acetonitrile, however, the chemical as well as Coulombic interaction between M + or M 2+ and simple anions has been demonstrated by careful examination with electrochemical and spectroscopic techniques. Rather strong chemical interactions between alkaline earth metal ions and the benzoate ion in acetonitrile were found by UV-visible and NMR spectroscopy [7].…”

Section: Introductionmentioning

confidence: 99%

“…We have also proposed [6] that the properties of bulk water are based on the hydrogen-bond network among a huge number of H 2 O molecules (e.g., n w > ~10 7 ). Water can lose its property as bulk water (H-O-H) to get that of a non-aqueous solvent, such as an alcohol (R-O-H) or even an ether (R-O-R) if the highly "self-assembled structure" of bulk water is destroyed in the following cases: (a) the residual water (c(H 2 O) ~10 -3 mol dm -3 ) in organic solvents; (b) aqueous solutions or organic solvent-water mixtures containing highly concentrated salts; (c) nanoscale water droplets in nano-tubes or reversed micelle systems; (d) water on metal electrodes, ion-exchange resins, proteins, organic solvents as the solvent extraction, and glass vessels; (e) water under supercritical conditions.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of enhanced oxidation ability of dilute nitric acid and dissolution of pure gold in seawater with nitric acid

Hojo

2019

Chemical Series

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It has been discovered that dilute nitric acid in reversed micelle systems can oxidize the Br ion to Br 2 and we have proposed that the nitryl (or nitronium) ion NO 2 + should be the active species in the oxidation process. Nitration of phenol in reversed micelle systems with dilute nitric acid, CHCl 3 /CTAC/H 2 O (2.0 mol dm-3 HNO 3 in the 1.0% (v/v) H 2 O phase), has been performed at 35 ºC to obtain 2-and 4-nitrophenols, where CTAC represents cetyltrimethylammonium chloride. In aqueous 2.0 mol dm-3 HNO 3 solution accompanied by 4.0 mol dm-3 LiCl (and a small amount of LiBr as the bromide resource), trans-1,4-dibromo-2-butene was successfully brominated to 1,2,3,4-tetrabromobutane. This result is good evidence that the Br ion can be oxidized to Br 2 in dilute nitric acid (2.0 mol dm-3) providing it contains concentrated salts. For chloride salts, the cation effects increased as Et 4 N + << Na + < Li + < Ca 2+ < Mg 2+. Even the evolution of Cl 2 has been demonstrated from < 2.0 mol dm-3 HNO 3 solution containing concentrated LiCl, MgCl 2 , and CaCl 2 as well as AlCl 3. The dissolution of precious metals (Au, Pt, and Pd), especially, of gold has been demonstrated in 0.1-2 mol dm-3 HNO 3 accompanied by alkali metal, alkaline earth metal, and aluminum chlorides. The complete dissolution time of pure gold plate (20±2 mg, 0.1 mm thickness) in 2.0 mol dm-3 HNO 3 accompanied by 1.0 mol dm-3 AlCl 3 has been shortened remarkably with temperature increase from 15 to 80 ºC. The dissolution rate constants, log (k /s-1), of a piece of gold wire (19.7±0.5 mg) in 20 mL of 2.0 mol dm-3 HNO 3 accompanied by the metal chlorides, in general, increase with increasing salt concentrations at 40 and 60 ºC. The gold can be dissolved in the solution of <1.0 mol dm-3 HNO 3 and <1.0 mol dm-3 HCl, i.e. a "dilute aqua regia." We have achieved a total dissolution of five pieces of the gold wire (totally 0.10 g) in 100 mL of the 1:1 mixture between seawater and 2.0 mol dm-3 HNO 3 at ca. 100 ºC.

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UV–visible, 1H and 13C NMR spectroscopic studies on the interaction between protons or alkaline earth metal ions and the benzoate ion in acetonitrile

Cited by 15 publications

References 45 publications

Suppressing carboxylate nucleophilicity with inorganic salts enables selective electrocarboxylation without sacrificial anodes

Suppressing carboxylate nucleophilicity with inorganic salts enables selective electrocarboxylation without sacrificial anodes

Environmental friendly anodizing of AZ91D magnesium alloy in alkaline borate–benzoate electrolyte

Mechanism of enhanced oxidation ability of dilute nitric acid and dissolution of pure gold in seawater with nitric acid

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