Interaction of Dioxovanadium(V) Ion with Methionine at Different Ionic Strengths

Subject Areas : Journal of Physical & Theoretical Chemistry

M. Kia ¹ , F. Gharib ² , G. Ghasemi ³

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Received: 2015-04-25 Accepted : 2015-04-25 Published : 2007-08-01

Keywords: Ionic strength, Formation constant, Methionine, Dioxovanadium(V),

Abstract :

The dependence on ionic strength of protonation of methionine and its complexation with dioxovanadium(V) isreported in sodium perchlorate solution as supporting electrolyte. The measurements have been performed at 25􀁻C using a combination of potentiometric and spectrophotometric techniques. The overall analysis of the presentand the previous data dealing with determination of stability constants at different ionic strengths allowed us toobtain a general equation, by which a formation constant determined at a fixed ionic strength can berecalculated, with a good approximation for another ionic strength in the range of 0.1 0.7 mol dm-3.