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Research Paper | Chemistry | Iraq | Volume 6 Issue 8, August 2017
Spectrophotometric and Thermodynamic Studies of Complexation between Catechin and Some of Transition Metals (II)
Ahmed.N Abd | Elham.M Al-Rufaie | Haider.N Hussein
Abstract: Cadimum and Nickel are toxic heavy metal when presented in a high level over it allowable limit. To detoxify this heavy metal a chelators were used as in a chelation therapy. This work studies the complexation of some chelator (Catechin) with Cd II, Ni II ions. A spectrophotometric technique was applied in water solvent in PH=7-7.5, at four different temperatures. No shift in it ?max but wrer increases in absorbance indicating the complex formation. The stoichiometry of these complexes were determined by a method of the continuous variation (Job's) method, it was found that Catechin-Cd, Catechin-Ni were (11). These chelators have a high tendency to complex with Ni II ion which was reflected by its high values of their equilibrium constants. Thermodynamic parameters indicate a spontaneous interaction (negative free energy change ?G), and the enthalpy changer for Catechin-Cd complex were positive and Catechin-Ni have negative ?H which depends on type of the interaction and the structures of the complexes.
Keywords: chelating agents, Catechin, , thermodynamic parameters and Catechincomplexation
Edition: Volume 6 Issue 8, August 2017,
Pages: 2211 - 2214