Acharya, Achyuta N. ; Dash, Anadi C. (1994) Base hydrolysis of (αβ S)-(o-methoxy benzoato) (tetraethylenepentamine) cobalt(III) ion: a comparative study of the role of ion pairs and micelles International Journal of Chemical Kinetics, 26 (7). 681–692. ISSN 0538-8066
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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/kin.550...
Related URL: http://dx.doi.org/10.1002/kin.550260702
Abstract
The kinetics of base hydrolysis of (αβ S)-(o-methoxy benzoato) (tetraethylenepentamine)cobalt(III) obeyed the rate law: kobs = kOH[OH-], in the range 0.05 □ [OH-]T, mol dm-3 □ 1.0, I = 1.0 mol dm-3, and 20.0-40.0°C. At 25°C, kOH = 13.4 ±0.4 dm3 mol-1 s-1, ΔH≠ = 93 ±2 kJ mol-1 and ΔS≠ = 90 ±5 JK-1 mol-1. Several anions of varying charge and basicity, CH3CO2-, SO32-, SO42-, CO32-, C2O42-, CH2(CO2)22-, PO43-, and citrate3- had no effect on the rate while phthalate2-, NTA3-, EDTA4-, and DTPA5- accelerated the process via formation of the reactive ion pairs. The anionic (SDS), cationic (CTAB), and neutral (Triton X-100) micelles, however, retarded the reaction, the effect being in the order SDS> CTAB > Triton X-100. The importance of electrostatic and hydrophobic effects of the micelles on the selective partitioning of the reactants between the micellar and bulk aqueous pseudo-phases which control the rate are discussed.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley and Sons. |
ID Code: | 68711 |
Deposited On: | 02 Nov 2011 12:56 |
Last Modified: | 02 Nov 2011 12:56 |
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