Synthesis and properties of hydrophilic and hydrophobic Deep Eu-tectic Solvents by different methods
2024
Martín, M. Isabel | García-Díaz, Irene | Rodríguez Cea, María Lourdes | Gutiérrez, María C. | Monte, Francisco del | López Gómez, Félix Antonio | Ministerio de Ciencia e Innovación (España) | European Commission | Martín, María Isabel [0000-0001-8534-992x] | García-Díaz, Irene[0000-0003-1963-2537] | Gutiérrez, C [0000-0001-8612-7974] | del Monte, Francisco [0000-0002-2868-0023] | López Gómez, Félix Antonio [0000-0001-9023-2996] | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
Deep eutectic solvents have emerged as a greener alternative and have attracted so much interest in the last two decades. This paper present alternative synthesis method to classical heating-stirring. The ultrasound method is one of the most promising syntheses DESs in terms of yield and energy. So, ultrasound synthesis method was studied to obtain hydrophobic (Aliquat 336: L-Menthol 3:7; Lidocaine: decanoic acid 1:2) and hydrophilic DESs based on Choline chloride and urea, ethylene glycol and oxalic acid. The physical characterization of DESs by comparison of FTIR spectra no show difference between DESs obtained by heating-stirring and ultrasound synthesis methods. The RMN spectra of the DESs obtained by heat-ing-stirring revealed the DESs formation. Density and viscosity properties of DESs were evaluated. The density values are similar for both synthesis methods. However, lower viscosity values are obtained to the hydrophilic DESs prepared by ultrasound methods.
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