Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry
ISSN: 0975-413X
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Abstract
Potentiometric Pka Determination of Biological Active Phenothiazine in Different Aqua-Organic Solvents
Author(s): Bansode TNPotentiometric titrations of phenothiazines derivatives were performed in methanol-water, ethanol-water, acetonitrile-water and dioxane-water mixtures with varying contents of organic solvent. All titrations were performed in aqua-organic medium at constant ionic strength (0.15 mol.dm−3) and at different temperatures (25 to 45°C). The pKa were determined at different aqua-organic proportions. Effect of temperature and dielectric constant on dissociation constant has been compared. The pKa values were then obtained by Yasuda-Shedlovsky extrapolation.
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