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IJC-A Vol.47A(03) [March 2008] >


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
Mishra, Sangeeta
Issue Date: Mar-2008
Publisher: CSIR
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.
Page(s): 390-393
ISSN: 0376-4710
Source:IJC-A Vol.47A(03) [March 2008]

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