Kinetics and mechanism of aquation of bromopentammine cobalt(III) cation assisted by ion-pairing succinate anion in ethane-2-diol-water mixtures

Ismail, Amel M.; Seleim, Seleim Mohamed; Zaghloul, Adel; Amira, Mohamed F.

doi:10.5155/eurjchem.3.2.196-201.583

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The data given in Table 2 show that the trend of the ion pair rate for malonate is greater than that of succinate [14]; such an increase may be attributed to the increased proportion of malonate dianion compared to succinate dianion (malonic acid has pK a ¼ 2:5 and 5.05) while (succinic acid has pK a ¼ 4:2 and 5.63). Also this behaviour may be discussed in terms of structure reactivity and solvent reactivity.…”

Section: Calculation Of the Ion-pair Concentration [Cpxlmentioning

confidence: 87%

Influence of Solvent upon Rates of Ion Pair Reactions: Studies on the Aquation of Bromopentamminecobalt(Iii) Perchlorate in Binary/Water-Ethan-1,2-Diol Mixtures

Amira

Ismail

Seliem

2010

Progress in Reaction Kinetics and Mechanism

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The kinetics of the aquation of bromopentamminecobalt(III) ion have been investigated in malonate media containing different percentages of ethan-1,2diol (up to 50%). The ion pair rate constant k ip , has been determined over a wide range of malonate buffer compositions using the Wyat and Davies treatment. The thermodynamic and extrathemodynamic correlations existing between those of the association reaction (DG o ass , DH o ass , DS o ass ) and of the ion pair aquation reactionThe kinetic solvent effects are examined in terms of the dielectric constant and water concentration effects on the ion pair rate constant. Also, the solvent effects are analysed in terms of Kamlet -Taft solvatochromic parameters and are applied successfully in mixed aqueous -ethan 1,2-diol mixtures. However, the extrema found in the change of DH 6 ¼ ip and DS 6 ¼ ip with the mole fraction of the co-solvent have been correlated well with that found in the change of the physical properties of the solvent -water mixtures with the solvent structure. Small changes of DG 6 ¼ ip with the mole fraction of the solvent are attributed to a quasi-mirror image compensation between DH 6 ¼ ip and DS 6 ¼ ip .

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Section: Calculation Of the Ion-pair Concentration [Cpxlmentioning

confidence: 87%

Influence of Solvent upon Rates of Ion Pair Reactions: Studies on the Aquation of Bromopentamminecobalt(Iii) Perchlorate in Binary/Water-Ethan-1,2-Diol Mixtures

Amira

Ismail

Seliem

2010

Progress in Reaction Kinetics and Mechanism

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“…Several achievements were investigated on the kinetics of aquation of halopentaammine cobalt(III) in different media [6][7][8][9][10][11][12]. It is well known that the halopentaammine cobalt(III) complexes aquated by an essentially dissociative process.…”

Section: Introductionmentioning

confidence: 99%

“…Table 1. Values of rate constants (ko×10 6 in sec -1 ) for the aquation of [Co(NH3)5Br] 2+ in tert-butanol (10-50%) Hydrogen peroxide was purchased from Riedel-de Haën. Hydrochloric acid was purchased from Chemical Management Consulting.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the leaving groups during the study of the aquation of halopentaammine cobalt(III) complex in tartarate at different percentage of tert-butanol

2018

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The experimental kinetic study of aquation for both complexes bromopentaammine cobalt(III) and chloropentaammine cobalt(III) ions in the presence of tartarate solution in mixed solvent media of water with tert-butanol (10-50%, v:v) was examined spectrophotometrically at different temperatures (30-60 °C) by comparing the special effects of the leaving group of chloro and bromo on the rate constant of aquation. Comparison of kip (rate constant of ion-pairing) for both complexes and show the non-linear plots of log (kip) ion-pair rate constants against the reciprocal of the dielectric constant D. The thermodynamic analyses of the kinetic data for both complexes have been discussed in terms of solvent effect on the ion-pair aquation reactions. The obtained isokinetic temperatures of these systems indicate the existence of compensation effect arising from solute-solvent interaction. The excessive change of ΔHip* and ΔSip* with the mole fraction of the co-solvent can be recognized to the change of the physical properties of the solvent-water mixture with the solvent structure. Undersized changes in ΔGip* with the mole fraction of the co-solvent was found, representing a compensating effects between ΔHip* and ΔSip*.

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The Reaction of 2-Chloroquinoxaline with Piperidine in DMSO–H2O and DMF–H2O Mixtures: Kinetics and Solvent Effects

Fathalla

Elmarassi

Omer³

et al. 2019

J Solution Chem

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Kinetics and mechanism of aquation of bromopentammine cobalt(III) cation assisted by ion-pairing succinate anion in ethane-2-diol-water mixtures

Cited by 5 publications

References 18 publications

Influence of Solvent upon Rates of Ion Pair Reactions: Studies on the Aquation of Bromopentamminecobalt(Iii) Perchlorate in Binary/Water-Ethan-1,2-Diol Mixtures

Influence of Solvent upon Rates of Ion Pair Reactions: Studies on the Aquation of Bromopentamminecobalt(Iii) Perchlorate in Binary/Water-Ethan-1,2-Diol Mixtures

Comparison of the leaving groups during the study of the aquation of halopentaammine cobalt(III) complex in tartarate at different percentage of tert-butanol

The Reaction of 2-Chloroquinoxaline with Piperidine in DMSO–H2O and DMF–H2O Mixtures: Kinetics and Solvent Effects

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