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Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University
 


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Iron Reduces Iron: A Spectroelectrochemical Insight of Ligand Effect on Iron Redox Potential


Paper Type 
Contributed Paper
Title 
Iron Reduces Iron: A Spectroelectrochemical Insight of Ligand Effect on Iron Redox Potential
Author 
Shabnum Bashir, Mohammad Mustafa, Syed Wasim Safvi, Nisar Ahmad Farhad and Masood Ahmad Rizvi*
Email 
masoodku2@gmail.com
Abstract:
The electron transfer reaction between two oxidation states of a transition metal redox couple is amazingly interesting.  The present study describes a combined spectropho- tometric and potentiometric investigation of redox reaction involving iron (III) and iron(II) oxidation states. The electron transfer reaction is seen to occur between iron-(III)phenanthroline complex and a series of iron-(II) complexes with water, EDTA, DPTA, NTA, Tiron and diphosphate ligands. The relative propensity of selected ligands towards this reaction, displayed in the potentiometric titration plots can be corroborated with the redox potential modification of Fe(III)-Fe(II) redox couple. The ligand effect on redox potential of the iron redox couple as the underlying concept of the reaction, has been thoroughly investigated and thermodynamically modeled. The differing abilities of EDTA and Tiron ligands towards the spontaneity of this reaction under different pH conditions were potentiometerically observed and spectrophotometrically rationalized with the degree of ligand chelation vis-a-vis complex stability and the resultant redox potential. The experiment can serve as a model for unique environmental and biological redox reactions and can be explored further for designing of novel redox systems for redox flow cells.
Start & End Page 
1087 - 1098
Received Date 
2017-01-04
Revised Date 
Accepted Date 
2017-03-28
Full Text 
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Keyword 
Iron oxidation states, Ligand effect, Potentiometric titrations, Spectrophotometry, EDTA, DPTA, Tiron, Speciation analysis, Thermochemical cycle, Iron redox couple
Volume 
Vol.45 No.2 (March 2018)
DOI 
Citation 
Bashir S., Mustafa M., Safvi S.W., Farhad N.A. and Rizvi* M.A., Iron Reduces Iron: A Spectroelectrochemical Insight of Ligand Effect on Iron Redox Potential , Chiang Mai Journal of Science, 2018; 45(2): 1087-1098.
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