Abstract
Four new ionic liquids (ILs) based on 1-(2-hydroxyethyl-3-methylimidazolium) cation with glycinate, serinate, alaninate, and prolinate amino acid anions have been synthesized, and their thermo-physical properties (density, viscosity, surface tension, and heat capacity) were measured. Data were described using empirical expressions to determine other physical–chemical properties, such as molecular volume, standard molar entropy, and lattice energy. Moreover, acute toxicity tests toward Scenedesmus quadricauda (green algae) and Vibrio fischeri have been conducted. The high values obtained for the 50% effective concentration (EC50) indicated that these new ionic liquids can be considered eco-friendly.
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•Four amino acid based ILs were synthesized and characterized.•Their thermophysical properties were determined over a range of temperatures.•The viscosities were significantly high due to the presence of strong hydrogen bond.•The newly studied AAILs being eco-friendly towards green algae and Vibrio fischeri