Extensive inhibition by ion pairing in a bimolecular, outer-sphere electron transfer reaction, reduction of a cobalt clathrochelate by ferrocene in methylene chloride

2001 ◽  
Vol 313 (1-2) ◽  
pp. 37-42 ◽  
Author(s):  
Joachim Pfeiffer ◽  
Karl Kirchner ◽  
Scot Wherland
Keyword(s):  
Electron Transfer ◽  
Transfer Reaction ◽  
Methylene Chloride ◽  
Ion Pairing ◽  
Outer Sphere ◽  
Electron Transfer Reaction ◽  
Outer Sphere Electron Transfer

Synthesis, CMC Determination, and Outer Sphere Electron Transfer Reaction of the Surfactant–Complex Ion, cis-[Co(en)2(4CNP)(DA)]3+ with [Fe(CN)6]4– in Micelles, β-cyclodextrin, and Liposome (Dipalmidoylphosphotidylcholine) Vesicles

2013 ◽  
Vol 66 (8) ◽  
pp. 930 ◽  
Author(s):  
Karuppiah Nagaraj ◽  
Sankaralingam Arunachalam
Keyword(s):  
Electron Transfer ◽  
Rate Constant ◽  
Transfer Reaction ◽  
Hydrophobic Effect ◽  
Outer Sphere ◽  
Electron Transfer Reaction ◽  
Pyridine Ligand ◽  
Physico Chemical ◽  
Different Temperatures ◽  
Outer Sphere Electron Transfer

The surfactant cobalt(iii) complex, cis-[Co(en)2(4CNP)(DA)](ClO4)3, en = ethylenediamine, 4CNP = 4-cyanopyridine, DA = dodecylamine, was synthesized and characterized by physico-chemical and spectroscopic methods. The critical micelle concentration value of this complex was obtained from the conductivity measurements at different temperatures to evaluate, ΔGm0, ΔHm0, and ΔSm0. The kinetics of outer sphere electron transfer reaction of this complex with Fe(CN)64– ion in micelles, β-cyclodextrin as well as in liposome vesicles media were studied. The rate constant increases with increase in the concentration of micelles but decreases in presence of β-cyclodextrin, which is a good structure breaker of micelles. In liposome vesicles media the rate constant is different at below and above phase transition temperature. The results have been explained based on the hydrophobic effect, the presence of pyridine ligand containing 4-cyano substituent and the reactants with opposite charge.

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