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  • Title: Kinetics of copper(II) catalyzed oxidation of iodide by iron(III) orthophenanthroline complex in aqueous solution.
    Author: Ishrat QU, Iftikhar A.
    Journal: Pak J Pharm Sci; 2005 Jul; 18(3):20-4. PubMed ID: 16380340.
    Abstract:
    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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