Anion-molecule complexes in solution. I. Nuclear magnetic resonance and infrared studies of halide ion-trihalomethane association

Green, R. D.; Martin, John S.

doi:10.1021/ja01016a010

Cited by 43 publications

(30 citation statements)

References 6 publications

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“…Mene´ndez et al (1996) proposed a model for explaining these reactions considering, in particular, the pyrone and lactone groups (they assumed all the other acidic oxygen surface groups suffer a similar fate). This model establishes that after the activated carbon is thermally treated in a nitrogen atmosphere, isolated unpaired electrons (free radicals) edge sites are formed, as well as carbon atoms with a triple bond character, leaving highly reactive carbon atoms in the resultant surface (Green andMartin, 1968, Mene´ndez et al, 1996).…”

Section: Introductionmentioning

confidence: 87%

Phenol and methylene blue adsorption on heat-treated activated carbon: Characterization, kinetics, and equilibrium studies

Sáenz-Alanís

García-Reyes

Soto-Regalado

et al. 2017

Adsorption Science & Technology

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A comprehensive study was performed for a thermally treated activated carbon to evaluate the influence of this treatment on the physical and chemical properties of the mineral activated carbon, as well as the adsorption toward phenol and methylene blue. After the heat treatment, surface area decreased and total pore volume diminished about 8.5%, and the total basic groups decreased 18% while the total acid groups increased 8% in comparison with the raw activated carbon. Equilibrium adsorption of phenol and methylene blue was described well with the Freundlich and Langmuir isotherm models, respectively. Adsorption kinetics of phenol and methylene blue was predicted adequately with the empirical pseudo-second-order model, the intraparticle diffusion model, and the homogeneous solid diffusion model, but mass transfer coefficients of the diffusion models help to better understand the adsorption phenomenon. Intraparticle diffusion seems to be the ratecontrolling step in the adsorption process, and heat-treated activated carbon in an inert atmosphere was a better adsorbent for both phenol and methylene blue than raw activated carbon.

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Section: Introductionmentioning

confidence: 87%

Phenol and methylene blue adsorption on heat-treated activated carbon: Characterization, kinetics, and equilibrium studies

Sáenz-Alanís

García-Reyes

Soto-Regalado

et al. 2017

Adsorption Science & Technology

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“…halide anions, and complexes have been described [2,11,12]. Indeed, the data in Table II show that the water co-extracted by Cl-into this solvent, there is a downfield shift of the para-and meta-protons which is proportional to the concentration of halide salt [20].…”

Section: Lbl-1630mentioning

confidence: 96%

“…The values decrease with increasing number of water molecules complexed to the anion, and show no sharp changes in magnitude, at least up to the 4 or 5 water molecules per ion studied. From pressure-composition isotherms, the existence of halide ion complexes with haloforms has been deduced [11], as had earlier been shown by both IR [2] and NMR [12] studies.…”

Section: Lbl-1630mentioning

confidence: 99%

Hydration of the halide ions in certain organic solvents

Kenjo¹,

Diamond²

1974

Journal of Inorganic and Nuclear Chemistry

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LBL-1630The amount of water co-extracted by the halide anions into several solvents has been determined. The order was always Gl-> Br-> I-, and at high organic..;.phase salt concentrations, the hydration numbers increased with increasing concentration, apparently paralleling the formation of ion pairs and higher ion aggregates. In nitrobenzene· the lower, limiting values are 3. 3, 1. 8, and 1. 0 moles of water per anion for Cl-, Br-, and I~, respectively.With dichloroethane as solvent, and more particularly with chloroform, solvation of the anion by the (weakly) acid proton of the diluent replaces part of the hydration, and the hydration number observed decreases markedly. For a number of reasons, the hydration numbers observed are lower limits to the first-shell hydration or coordination number of the anion.

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“…As a part of a continuing study of anionmolecule association in solution, the interaction of formamide-15N with bromide ion in ethanenitrile solvent has been investigated by essentially the same technique as that developed earlier (7). The "N species was used to make Can The chemical shift and coupling constant data for the various solutions are presented in Table I.…”

Section: Resultsmentioning

confidence: 99%

Proton magnetic resonance studies of hydrogen bonding of formamide with bromide ion in solution. The non-equivalence of the amide hydrogens

Green¹

1969

Can. J. Chem.

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The proton magnetic resonance spectrum of a dilute solution of formamide-15N in CH,CN at 15 "C undergoes definite changes as bromide ion in the form of (C,H,),NBr is added. The two amide resonances shift downfield, but at different rates. It is found that each amide hydrogen forms hydrogen bonds with bromide ions, apparently by way of independent equilibrium processes. The hydrogen bond at the trolls position to the carbonyl oxygen is favored by about 0.7 kcal mole-' over that at the cis position. It is postulated that electrostatic repulsion between any base and the carbonyl oxygen of an arnide group, tends to favor formation of hydrogen bonds at the more remote, trans, hydrogen. This may account for the formation of hydrogen-bonded chains by N-monosubstituted amides preferentially with the amide hydrogen trorzs to oxygen.

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Anion-molecule complexes in solution. I. Nuclear magnetic resonance and infrared studies of halide ion-trihalomethane association

Abstract: In weakly solvating media, the trihalomethanes associate specifically with the anions of tetraalkylammonium salts. The concentration and temperature dependence of the trihalomethane proton shielding has been (1) A

Cited by 43 publications

References 6 publications

Phenol and methylene blue adsorption on heat-treated activated carbon: Characterization, kinetics, and equilibrium studies

Phenol and methylene blue adsorption on heat-treated activated carbon: Characterization, kinetics, and equilibrium studies

Hydration of the halide ions in certain organic solvents

Proton magnetic resonance studies of hydrogen bonding of formamide with bromide ion in solution. The non-equivalence of the amide hydrogens

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