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Spectrophotometric determination of reliable association constant of weakly bounded charge transfer complex in solution

Author: 
Srivastava, K. K., Shubha Srivastava, Md. Tanweer Alam and 1Rituraj
Subject Area: 
Physical Sciences and Engineering
Abstract: 

The interaction between picric acid (acceptor) and o-phenanthroline (donor) have been studied spectrophotometrically in THF solvent for the evaluation of reliable value of association constant in the formation of weakly bounded charge transfer complex. The value of association constant (K) was calculated using standard equations such as Benesi-Hildebrand, Scott, Foster Hammick Waldley, Rose Drago Ayad, El-Hati, Lang, Scatchard, Seal-Sil Mukherjee, at wavelengths358.5 378, 400 and 420 nm in THF solvent. The value of association constant of the 1:1 complex insolution, calculated by different standard equations ranges between 1561 and 4928. The wide range of variation of the calculated values of K led us to guest for the reliable value. The reliability of different calculated values was examined. The Benesi- and Hildebrand method was found to give most reliable value of K. The most reliable value of K for complex was found to be 1907. The stoichiometry of the complex was established spectrophotometrically by Jobs’s method of constant variation.

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