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Investigation of the Effect of Alkyl Chain Length on Molecular Interactions Between Methyl Benzoate with Alcohols: A Study of Physicochemical Properties

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Abstract

Densities, speeds of sound, and viscosities of binary mixtures of methyl benzoate (MB) with ethanol, 1-propanol, and 1-butanol were measured at temperature ranging from T = 293.2 to 313.2 K and refractive indices were determined at T = 303.2 K. Excess molar volumes, VE, isentropic compressibility deviations ∆κs and viscosity deviations, Δη, were obtained and fitted with the Redlich–Kister equation with satisfactory results. Based on the measured and derived physicochemical properties, the influence of the alkyl chain length of the alcohol on the molecular interactions of the studied mixtures was explored. The results show that both hydrogen bond interaction between carbonyl group of MB and hydroxyl group of alcohol and the packing efficiency, such as accommodation of alcohol in the interstice of MB, play an important role in the microstructure of the mixtures, which leads to the disruption of alcohol with the addition of MB. Moreover, by comparing VE, ∆κs and Δη values of MB (1) + alcohol (2) systems at T = 303.2 K, it is found that the strength of hydrogen bond interaction and the packing efficiency significantly weakens with increasing alkyl chain length of alcohol in going from ethanol to 1-butanol, resulting in the VE values of the studied systems gradually changing from a negative deviation to an S shape, the ∆κs and Δη values have negative deviations, and the ∆nD values have positive deviations. The obtained results will provide thermodynamic guidance for the industrial purification of methyl benzoate.

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Acknowledgements

This work was supported by the National Science Foundation of China (No. 21978172), National Natural Science Foundation of Zhejiang Province (No. Y18B060014), National Undergraduate Training Program for Innovation and Entrepreneurship (No. 201810349013), Undergraduate Scientific and Technological Innovation Project of Shaoxing University, the Key Teacher Training Research of Shaoxing University (No. 2016227).

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  1. Department of Chemistry, Shaoxing University, Shaoxing, 312000, China

    Tingting Chen, Xiao Feng, Yuqiao Yin & Yingjie Xu

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Chen, T., Feng, X., Yin, Y. et al. Investigation of the Effect of Alkyl Chain Length on Molecular Interactions Between Methyl Benzoate with Alcohols: A Study of Physicochemical Properties. J Solution Chem 49, 1402–1418 (2020). https://doi.org/10.1007/s10953-020-01029-4

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