Quratul Ain Ishrat, Bid Iftikhar.
Kinetics of copper(II) catalyzedoxidation of iodide by iron(III) Orthophenanthroline complex in aqueous solution.
Pak J Pharm Sci Jan ;18(3):20-4.

Orthophenanthroline (OPT) forms stable complex with Iron(II) at pH 3.5. In presence of Ce(IV) it forms a metal-ligand complex in which Fe is in the form of Fe+++ for short period when mixed in mole ratio of 1:3 (Iron: OPT). This complex is stable for not more than 30 minutes. At the end, this complex reduces itself back to iron(II)orthophenanthroline [Fe(OPT)3]+2 complex. In present work, this property of iron(III) complex was used to oxidize I-1 to I2. Analysis of [Fe(OPT)3]+2 was carried out at 510 nm to monitor the reduction of [Fe(OPT)3]+3 complex. Copper was used as a catalyst during the described reaction to convert back [Fe(OPT)3]+2. The reaction increased with increase in copper concentration. The conversion of [Fe(OPT)3]+3 to [Fe(OPT)3]+2 followed first order kinetics.

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