Electron Donor-Acceptor Interaction of 8-Hydroxyquinoline with Citric Acid in Different Solvents : Spectroscopic Studies

Charge transfer complex formation between 8-hydroxyquinoline as the electron donor and citric acid as the electron acceptor has been studied spectrophotometrically in ethanol and methanol solvents at room temperature. Absorption band due to charge transfer complex formation was observed near 320 and...

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Published in:Journal of Applied Chemistry (Hindawi) 2014-08, Vol.2014 (2014), p.1-7
Main Authors: Jado, Demelash, Siraj, Khalid, Meka, Nathan
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Language:English
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description Charge transfer complex formation between 8-hydroxyquinoline as the electron donor and citric acid as the electron acceptor has been studied spectrophotometrically in ethanol and methanol solvents at room temperature. Absorption band due to charge transfer complex formation was observed near 320 and 325 nm in ethanol and methanol, respectively. The stoichiometric ratio of the complex has been found 3 : 1 by using Job’s and conductometric titration methods. Benesi-Hildebrand equation has been applied to estimate the formation constant and molecular extinction coefficient. It was found that the value of formation constant was larger in ethanol than in methanol. The physical parameters, ionization potential, and standard free energy change of the formed complex were determined and evaluated in the ethanol and methanol solvents.
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title Electron Donor-Acceptor Interaction of 8-Hydroxyquinoline with Citric Acid in Different Solvents : Spectroscopic Studies
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