Paper Information

Journal:   JOURNAL OF THE IRANIAN CHEMICAL SOCIETY(JICS)   JUNE 2014 , Volume 11 , Number 3; Page(s) 615 To 621.
 
Paper: 

ELECTRON TRANSFER REACTIONS ASSOCIATED WITH ETHYL VIOLOGEN-β-CYCLODEXTRIN COMPLEXATION: EQUILIBRIUM AND KINETIC ASPECTS

 
 
Author(s):  SHAZIA AKBAR*, NAQVI I.I., MOHAMMAD M.
 
* DEPARTMENT OF CHEMISTRY, UNIVERSITY OF KARACHI, HOUSE NO. 4, STREET NO. 1, AREA 2/A, LANDHI NO. 3, KARACHI, 75160, PAKISTAN
 
Abstract: 

Formation of the complex of ethyl viologen in its cationic (Ev+) and neutral (Ev?) forms with ?-cyclodextrin (b-CD) was investigated by means of voltammetric technique in buffer solution of pH 7.00. The number of bCD (n or m) per viologen species (Ev+) or (Ev?), bonding equilibrium constants as well as bonding rate constants was calculated. The calculated values ofK (1) eqandK (2) eq (pertaining to the bonding of Ev+and Ev? with bCD) are 13.6 M–n and 2.1×103 M?m , respectively, whereas the calculated values of n and m are 0.54 and 1.25, respectively. The bimolecular rate constant for the Ev??bCD inclusion complex formation is 3.03×103 M?1s?1. These results are supported by the simulation of the experimental cyclic voltammograms. This study also highlights the significance of the proposed electrochemical method as compared to earlier studies on viologen-Cyclodextrin systems

 
Keyword(s): VIOLOGEN, ?CD SYSTEM, INCLUSION COMPLEX, CYCLIC VOLTAMMETRY, DIGITAL SIMULATION
 
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