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|Title:||Proton transfer equilibria between o-substituted benzoic acids and the carbinol base of crystal violet in apolar aprotic solvents: Chemometric analysis of ortho effect|
|Authors:||Sengupta, Susanta K|
|Abstract:||Toluene-phase reaction equilibria between a set of o-substituted benzoic acids and crystal violet carbinol base producing a coloured ion-pair have been studied spectrophoto-metrically at 28±1ºC. Chemometric analysis on the basis of both Charton’s and Fujita-Nishioka’s multiparameter approaches for o-substituent effects on the equilibrium constants show that proximity electronic effect of an o-substituent is the main intrinsic contribution to the anomalous ortho effect with its steric factor contributing merely a minor effect. However, in the aqueous phase the steric contribution becomes significant due to hydration induced substantial enhancement in the bulk of the COOH group and the o-substituent.|
|Appears in Collections:||IJC-A Vol.47A(03) [March 2008]|
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|IJCA 47A(3) (2008) 390-393.pdf||115.18 kB||Adobe PDF||View/Open|
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