Abstract
The present study aims to expedite the synthesis of protic ionic liquids (PILs) using solvents to investigate the correlation between hydrogen bond donor interactions and the carbon length's impact on thermal stability and viscosity. PILs consist of anions derived from organic acids paired with the 2-hydroxyethylammonium cation. Structural characterization involved NMR spectroscopy, FTIR, mass spectrometry, elemental analysis, water content assessment, and electrochemical stability. Results confirmed the structures and purity levels of PILs, thermal stability was found to be influenced by ion interactions, with cation vaporization determining the PILs decomposition temperature. Notably, 2-hydroxyethylammonium ascorbate (PIL2), oleate 2-hydroxyethylammonium citrate (PIL3), and 2-hydroxyethylammonium citrate (PIL4) exhibited the highest viscosity values in the samples. Toxicity assessments performed on Artemia salina nauplii revealed moderate toxicity for PILs, except PIL1 with low toxicity (LC50 of 16.14 mmol l-1), with toxicity generally increasing with higher PIL viscosity.
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