TY - JOUR

T1 - VOLUMETRIC PROPERTIES AND AGGREGATION BEHAVIOUR OF AQUEOUS SOLUTIONS OF NOVEL 1-DECYL-3-METHYLIMIDAZOLIUM-BASED AMINO ACID IONIC LIQUIDS

AU - Алопина, Елена Владимировна

AU - Макаров, Дмитрий

AU - Сафонова, Евгения Алексеевна

PY - 2023/3/1

Y1 - 2023/3/1

N2 - In their applications, ionic liquids (ILs) exhibit many unique properties not only due to the nature of cations and anions but also due to the interaction of ILs with other components and the microstructure of ILs in the systems. That is why aggregation of ILs in solutions has been in focus of many studies. Amino acid ionic liquids (AAIL) are considered a new, more eco-friendly type of IL. The aggregation behavior of the newly synthesized 1-decyl-3-methylimidazolium-based AAILs [C10mim] [AA] (AA = L-serine, L-threonine, L-lysine) in aqueous solutions was studied by means of densitometry at different temperatures (288.15–323.15) K and by conductometry at 298.15 K. Moreover, the viscosity of aqueous solutions of AAILs at 1.18 mol·kg−1 was determined in the temperature range (293.15–323.15) K. For comparison of the estimated characteristics, 1-decyl-3-methylimidazolium ILs with halogen anions, [C10mim]Br and [C10mim]Cl, were studied. The aggregation behavior of AAILs in aqueous solutions was discussed based on the data on critical micelle concentration (cmc) and degree of counter-ion binding; the values of standard Gibbs energy of micellization, the apparent molar volume at the cmc, apparent molar volume in the micellar region, and the change in the apparent molar volume upon micellization were derived. The obtained results were further analyzed to understand the specificity of the self-aggregation behavior of AAILs and to discuss this effect in terms of solute–solute and solute–solvent interactions. These results can open up opportunities for potential design of new surfactants.

AB - In their applications, ionic liquids (ILs) exhibit many unique properties not only due to the nature of cations and anions but also due to the interaction of ILs with other components and the microstructure of ILs in the systems. That is why aggregation of ILs in solutions has been in focus of many studies. Amino acid ionic liquids (AAIL) are considered a new, more eco-friendly type of IL. The aggregation behavior of the newly synthesized 1-decyl-3-methylimidazolium-based AAILs [C10mim] [AA] (AA = L-serine, L-threonine, L-lysine) in aqueous solutions was studied by means of densitometry at different temperatures (288.15–323.15) K and by conductometry at 298.15 K. Moreover, the viscosity of aqueous solutions of AAILs at 1.18 mol·kg−1 was determined in the temperature range (293.15–323.15) K. For comparison of the estimated characteristics, 1-decyl-3-methylimidazolium ILs with halogen anions, [C10mim]Br and [C10mim]Cl, were studied. The aggregation behavior of AAILs in aqueous solutions was discussed based on the data on critical micelle concentration (cmc) and degree of counter-ion binding; the values of standard Gibbs energy of micellization, the apparent molar volume at the cmc, apparent molar volume in the micellar region, and the change in the apparent molar volume upon micellization were derived. The obtained results were further analyzed to understand the specificity of the self-aggregation behavior of AAILs and to discuss this effect in terms of solute–solute and solute–solvent interactions. These results can open up opportunities for potential design of new surfactants.

KW - Critical micelle concentration

KW - Ionic liquids

KW - Specific conductivity

KW - Viscosity

KW - Volumetric properties

UR - https://www.mendeley.com/catalogue/9f9d5a61-cc84-33a7-a28e-e9b16e1ee986/

U2 - 10.1007/s10953-022-01232-5

DO - 10.1007/s10953-022-01232-5

M3 - Article

VL - 52

SP - 288

EP - 303

JO - Journal of Solution Chemistry

JF - Journal of Solution Chemistry

SN - 0095-9782

IS - 3

ER -