The kinetics of reduction of tris(1,10erthophenantiroline)iron(III) ion by two different reductants hexacyanoferrate(II) ion and bis(s-cyclopentadienyl)iron(II) has been spectrophotometrically investigated in studies median. Measurements were recorded under pseudo-first order condition. The rate of electron transfer between tris(1,10-orthophenan- throline)iron(III) and each reductants was measured. The rate laws are suggested to be, rate = k1 [Fe(C5N5)2] [Fe(o-phen)3]3+ /1 + K[H+] and rate = k [Fe(C5H5)2] [Fe(o-phen)3]3+ for the reduction of tris(1,10-orthophenanthroline)iron(III) ion with hexacyano-ferrate(II) ion and bis(scyclopentadienyl)iron(II) respectively, showing first order with respect to each of the reactants in the both cases. It was found that the rate of reaction with hexacyanoferrate(II) is faster than that of bis(p-syclopentadienyl)iron(II) having the second order rate constant values of 8.33 x 107M-1s-1 and 5 x 106 M-1s-1 respectively.
I I NAQVI ,M A FARRUKH ,
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