The kinetics of electron transfer reaction of methylene green and titanium trichloride in different solvents
- Autores: Saeed R.1, Nadeem S.1
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Afiliações:
- Department of Chemistry
- Edição: Volume 90, Nº 6 (2016)
- Páginas: 1143-1150
- Seção: Chemical Kinetics and Catalysis
- URL: https://journals.rcsi.science/0036-0244/article/view/168290
- DOI: https://doi.org/10.1134/S0036024416060194
- ID: 168290
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Resumo
The kinetics of the electron transfer reaction of methylene green and titanium trichloride was investigated in different solvents by spectrophotometry at different temperatures. The the reaction rate was determined by monitoring the absorbance as a function of time at λmax 655 nm. The reaction is pseudo-first order, dependent only on the concentration of titanium trichloride at a fixed concentration of methylene green.
The effect of an aqueous alcoholic solvent was studied in the acidic range of pH from 4 to 7. It was observed that the reaction rate increased with an increase in polarity of the reaction medium. The the reaction rate was high in acidic conditions and decreased with a further increase in acidity. The increase in temperature increased the rate of the electron transfer reaction of methylene green and titanium trichloride. The activation energy (Ea) was calculated by the 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 the activation energy (Ea), enthalpy change (ΔH), free energy change (ΔG), and entropy change (ΔS) were also evaluated
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Sobre autores
Rehana Saeed
Department of Chemistry
Autor responsável pela correspondência
Email: rehana_saeed01@hotmail.com
Paquistão, Karachi, 75270
Syed Nadeem
Department of Chemistry
Email: rehana_saeed01@hotmail.com
Paquistão, Karachi, 75270