Paper Information

Journal:   JOURNAL OF THE IRANIAN CHEMICAL SOCIETY(JICS)   MARCH 2008 , Volume 5 , Number 1; Page(s) 29 To 36.
 
Paper: 

THE KINETICS AND MECHANISM OF OXIDATION OF HEXACYANOFERRATE(II) BY PERIODATE ION IN HIGHLY ALKALINE AQUEOUS MEDIUM

 
Author(s):  NAIK R.M.*, SRIVASTAVA A., ASTHANA A.
 
* DEPARTMENT OF CHEMISTRY, UNIVERSITY OF LUCKNOW, LUCKNOW-226 007 (U.P) INDIA
 
Abstract: 

The oxidation of hexacyanoferrate(II) by periodate ion has been studied spectrophotometrically by registering an increase in absorbance at 420 nm (lmax of yellow colored [Fe(CN)63-] complex under pseudo first-order conditions by taking excess of [IO 4-] over [Fe(CN)64-]. The reaction conditions were: pH = 9.5 ± 0.02, I = 0.1 M (NaCl) and Temp. = 25 ± 0.1 oC. The reaction exhibited first-order dependence on each [IO4-] and [Fe(CN)64-]. The effects of variations of pH, ionic strength and temperature were also studied. The experimental observations revealed that the periodate ion exists in its protonated forms viz. [H2IO6]3- and [H3IO6]2- while [Fe(CN)6]4- is present in its deprotonated form throughout the pH region selected for the present study. It has also been observed that deprotonated form of [Fe(CN)64-] and protonated forms of periodate ion are the most reactive species towards oxidation of [Fe(CN)6 4-]. The repetitive spectral scan is provided as an evidence to prove the conversion of [Fe(CN)64-] to [Fe(CN)63-] in the present reaction. The activation parameters have also been computed using the Eyring's plot and found to be, DH = 51.53 ± 0.06 kJ mol-1, DS = -97.12 ± 1.57 J K-1 mol-1 and provided in support of a most plausible mechanistic scheme for the reaction under study.

 
Keyword(s): KINETICS AND MECHANISM, HEXACYANOFERRATE(II) OXIDATION, PERIODATE OXIDATION, HEXACYANOFERRATE(II), PERIODATE
 
References: 
  • ندارد
 
  pdf-File tarjomyar Yearly Visit 76
 
Latest on Blog
Enter SID Blog