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Study of Malachite Green Fading in Water–Ethanol–Ethylene Glycol Ternary Mixtures

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Abstract

The rate constant of malachite green (MG+) alkaline fading was measured in water–ethanol–ethylene glycol ternary mixtures. This reaction was studied under pseudo-first-order conditions at 283–303 K. In each series of experiments, the concentration of ethanol was kept constant and the concentration of ethylene glycol was changed. It was shown that due to hydrogen bonding and hydrophobic interaction between MG+ and alcohol molecules the observed reaction rate constant, \( k_{\text{obs}} \), increased in the water–ethanol–ethylene glycol ternary mixtures. The fundamental rate constants of MG+ fading in these solutions (\( k_{1} \), \( k_{ - 1} \) and \( k_{2} \)) were obtained by the SESMORTAC model. Analysis of \( k_{1} \) and \( k_{2} \) values in solutions containing constant ethanol concentrations show that in low concentrations of ethylene glycol, hydrogen bonding formed between ethanol and ethylene glycol molecules and in high concentrations of ethylene glycol, ethanol as a solvent for ethylene glycol affected the reaction rate.

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Abbreviations

SESMORTAC:

Study of effect of solvent mixture on the one-step reaction rates using the transition state theory and cage effect

ACSM:

Activated complex formed in the second mechanism

ACSMbm :

ACSM formed at the bm point

ACSM1 :

ACSM formed in the first zone

AC:

Activated complex

n :

Number of molecules of solvent 1 in the solvent cage of transition state that are replaced by the same number of solvent 2 molecules in the transition state

mc :

mechanism change

\( k_{mc(i - 1)} \) :

Rate constant at the \( mc_{i - 1} \) point

\( k_{bm} \) :

Observed rate constant

\( v \) :

Reaction rate

bm :

Binary mixture

ter :

Ternary mixture

i :

The ith zone

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  1. Department of Chemistry, Faculty of Science, Lorestan University, 68137-17133, Khoramabad, Iran

    Babak Samiey & Somayeh Ahmadi

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  1. Babak Samiey
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  2. Somayeh Ahmadi
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Samiey, B., Ahmadi, S. Study of Malachite Green Fading in Water–Ethanol–Ethylene Glycol Ternary Mixtures. J Solution Chem 42, 151–164 (2013). https://doi.org/10.1007/s10953-012-9916-2

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