Aquation kinetics of chloro- and bromo-pentamminecobalt(III) ions in water-acetone mixtures

Amira, Mohamed F.; El-Shazly, S. A.; Sallam, S. A.; Khalil, Mohamed M.

doi:10.1007/bf01023124

Cited by 9 publications

(3 citation statements)

References 26 publications

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“…It was found that the rate of aquation of [Co(dien)(en)Cl] is always higher than that of [Co(NH 3 ) 5 Cl] [8,9] (under the same experimental conditions) due to the release of steric strain in forming a dissociated transition state, thus, should react more rapidly.…”

Section: Resultsmentioning

confidence: 93%

Solvent effects on the kinetics of aquation of ?-chloro(diethylenetriamine) (ethylenediamine)cobalt(III) ion in mixed aqueous solvents

Zaghloul

1997

Int. J. Chem. Kinet.

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Solvent effects on the kinetics of aquation of [Co(dien)(en)Cl] have been investigated within the temperature range (40 -60°C) in acetone-water and ethanol-water media of varying solvent compositions up to 60% by weight of the organic solvent component. The variation of the activation parameters (⌬G # , ⌬ H # , and ⌬S # ) with the mole fraction of the organic solvent component was analyzed and discussed. The isokinetic plots were linear in both solvent systems and revealed the existence of compensation effect due to a strong solute-solvent interactions. The correlation of log k with the ionizing power (Y) was found to be linear in both solvent mixtures. Moreover, the correlation of log k with was linear in case of ethanol-water medium while in case of acetone-water it was nonlinear.

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Section: Resultsmentioning

confidence: 93%

Solvent effects on the kinetics of aquation of ?-chloro(diethylenetriamine) (ethylenediamine)cobalt(III) ion in mixed aqueous solvents

Zaghloul

1997

Int. J. Chem. Kinet.

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“…Analar) was further redistilled , and mixtures were prepared using doubly distilled water. The [Co (NH 3 ) 5 Br] Br 2 complex was prepared by the method of Booth [10] and then converted to the perchlorate salt in crystalline form. Na 2 CO 3 (dried at 300 C for 3 hr) was made up by weight from (B.D.H.…”

Section: Reagentsmentioning

confidence: 99%

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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“…The solvolysis kinetics of some halogenopentaamminecobalt(III) ions in aqueous organic mixed solvents have been reported. [1][2][3][4] Compared with [Co(NH 3 ) 5 Cl] 2ǹ , [Co(NH 2 Me) 5 Cl] 2ǹ presents a large hydrophobic surface to the solution. In the present work the solvolysis of [Co(NH 2 Me) 5 Cl] 2ǹ , which occurs through a dissociative interchange (I d ) mechanism, 5 was studied in aqueous mixtures of methanol and propan-2-ol.…”

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confidence: 99%

Kinetics of the solvolysis of the Chloropentakis(methylamine)cobalt(III) Ion in Water–Methanol and Water–Propan-2-ol Mixtures†

Deng¹,

Ye²,

Huatong³

et al. 1997

J. Chem. Res. (S)

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Aquation kinetics of chloro- and bromo-pentamminecobalt(III) ions in water-acetone mixtures

Cited by 9 publications

References 26 publications

Solvent effects on the kinetics of aquation of ?-chloro(diethylenetriamine) (ethylenediamine)cobalt(III) ion in mixed aqueous solvents

Solvent effects on the kinetics of aquation of ?-chloro(diethylenetriamine) (ethylenediamine)cobalt(III) ion in mixed aqueous solvents

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

Kinetics of the solvolysis of the Chloropentakis(methylamine)cobalt(III) Ion in Water–Methanol and Water–Propan-2-ol Mixtures†

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