The Kinetics of Electron Transfer Reaction of Methylene Blue and Titanium Trichloride in different Solvents

Authors

  • Rehana Saeed Saeed Department of Chemistry, University of Karachi, Karachi-75270, Pakistan

DOI:

https://doi.org/10.24297/jac.v6i2.6583

Keywords:

: Methylene Blue,, Trichloride, Alcohols, Thermodynamics

Abstract

The kinetics of the electron transfer reaction of methylene blue and titanium trichloride was studied in water and aqueous
alcoholic solvents at various temperatures by spectrophotometry. The rate of reaction was observed by taking change in
absorbance as a function of time at λmax 660 nm. The reaction is pseudo-first order, dependent on concentration of titanium
trichloride at fixed concentration of methylene blue.
The effect of solvent was studied in the pH/Ho range from 4 to 7. It was observed that the rate of reaction increased with
increase in polarity of the reaction medium. The rate of reaction was high in acidic condition and decreased with further
increase in hydrogen ions activity. The increase in temperature increased the rate of electron transfer reaction of methylene
blue and titanium trichloride. Activation energy (Ea) was calculated by Arrhenius relation. The absence of any reaction
intermediate was confirmed by spectroscopic and kinetic investigations. A plausible mechanism for the reaction in line with
outer-sphere reaction pathway has been proposed. Thermodynamic parameters such as activation energy (Ea), enthalpy
change (∆H), free energy change (∆G) and entropy change (∆S) were also evaluated.

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Published

2017-04-24

How to Cite

Saeed, R. S. (2017). The Kinetics of Electron Transfer Reaction of Methylene Blue and Titanium Trichloride in different Solvents. JOURNAL OF ADVANCES IN CHEMISTRY, 6(2), 940–957. https://doi.org/10.24297/jac.v6i2.6583

Issue

Vol. 6 No. 2 (2014)

Section

Articles

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