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Apparent molar volume, conductivity, and fluorescence studies of ternary systems of dipeptides + ionic liquids ([Cnmim]Br, n = 10, 14) + water at different temperatures

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Abstract

Densities, conductivities, and fluorescence spectra of two imidazolium ionic liquids ([Cnmim]Br, n = 10, 14)-glycyl dipeptide-water mixtures were measured as a function of temperature. The density data have been utilized to calculate the apparent molar volumes, standard partial molar volumes (V 02,φ ), standard partial molar volumes of transfer from water to aqueous ionic liquids solutions (Δt V°), the hydration number (N H), partial molar expansibility (E 0φ ), and Hepler’s constant of glycyl dipeptides. Through the electrical conductivity measurements, the c cmc values at different temperatures and a series of thermodynamic parameters (ΔG o m , ΔH o m , and ΔS o m ) of micellization of [Cnmim]Br (n = 10, 14) in aqueous glycyl dipeptides solutions are evaluated. The pyrene fluorescence spectra were used to study the change of micropolarity produced by the interaction of [Cnmim]Br with glycyl dipeptide, and the aggregation behavior of [Cnmim]Br (n = 10, 14). The results shown above have been explained in terms of solute–solvent interactions and structural changes in the mixed solutions. The interaction between [Cnmim]Br (n = 10, 14) and glycyl dipeptide is affected by temperature and hydrocarbon chain length of the dipeptides.

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Acknowledgment

The project is financially supported by the Natural Science Foundation of China (No. 20973158).

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Authors and Affiliations

  1. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, People’s Republic of China

    Xiangli Wen, Zhenning Yan, Yunxia Kang & Shuangyan Zhang

Authors
  1. Xiangli Wen
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  2. Zhenning Yan
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  3. Yunxia Kang
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  4. Shuangyan Zhang
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Correspondence to Zhenning Yan.

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Wen, X., Yan, Z., Kang, Y. et al. Apparent molar volume, conductivity, and fluorescence studies of ternary systems of dipeptides + ionic liquids ([Cnmim]Br, n = 10, 14) + water at different temperatures. Colloid Polym Sci 293, 2485–2495 (2015). https://doi.org/10.1007/s00396-015-3644-2

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  • DOI: https://doi.org/10.1007/s00396-015-3644-2

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