The photokinetics of phenothiazine dyes with titanium trichloride in different solvents

The kinetic parameters of photoinduced electron transfer reaction of two phenothiazine dyes, methylene blue and methylene green with titanium trichloride, were determined in water and different aqueous‐alcoholic solvents at different acidities by using a specially designed optical system. The rate o...

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Bibliographic Details
Published in:International journal of chemical kinetics 2019-06, Vol.51 (6), p.379-389
Main Authors: Nadeem, Syed Muhammad Saqib, Saeed, Rehana
Format: Article
Language:English
Subjects:
dye
Dyes
Electron transfer
Methylene blue
rate constant
Rate constants
Reaction kinetics
reaction mechanism
Reaction mechanisms
solvent
Solvents
Titanium
Titanium chlorides
titanium trichloride
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Summary:The kinetic parameters of photoinduced electron transfer reaction of two phenothiazine dyes, methylene blue and methylene green with titanium trichloride, were determined in water and different aqueous‐alcoholic solvents at different acidities by using a specially designed optical system. The rate of photoinduced electron transfer reaction was measured by determining the quantum yield of the reaction. The methylene green had a higher reactivity as compared to methylene blue with titanium trichloride. The graphical analysis showed that the reaction of dye with titanium trichloride follows pseudo–first‐order kinetics. A reaction mechanism was proposed by considering the different excited states of dye and their possible interaction with the solvent and titanium trichloride. The different steps in the reaction mechanism were taken into consideration for deriving rate equations, which were used to determine the different rate constants in the reaction mechanism in different solvents.
ISSN:0538-8066
1097-4601
DOI:10.1002/kin.21261