Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Deep eutectic solvents (DES) are mixtures of two or three components that have a freezing point lower than that of the components. The properties of DES are tunable through the choice and ratio of the components. Three-component or ternary DES increase the flexibility to control the properties compared to binary DES. Two chiral ternary DES composed of tetraoctylammonium bromide (TOABr), tetrabutylammonium bromide (TBABr), ( R )-ethyl mandelate (( R )-EM) or methyl-(2 R )-2-hydroxy-3-phenylpropanoate (( R )-MHPP) were studied. Solid–liquid equilibrium measurements showed that only TOABr:TBABr:( R )-MHPP with 0.66 mole fraction of ( R )-MHPP were liquid at room temperature, but TOABr:TBABr:( R )-EM mixtures were liquid over a wider range, 0.6–0.8, mole fraction of ( R )-EM. The density, viscosity, conductivity, and polarity were measured for three TOABr:TBABr:( R )-MHPP and six TOABr:TBABr:( R )-EM mixtures and compared to the TBABr:( R )-MHPP and TBABr:( R )-EM. The enantioselectivity of the ternary DES was measured using circularly polarized luminescence (CPL) spectroscopic measurements of a luminescent lanthanide complex dissolved in the solvents. The ternary DES, TOABr:TBABr:( R )-MHPP and TOABr:TBABr:( R )-EM, exhibit higher enantioselectivity than the corresponding binary DES, TBABr:( R )-MHPP, TBABr:( R )-EM, and TOABr:( R )-EM.
Source: ACS Omega
Authors: Hayden Teague, Ashton Lake, Todd A. Hopkins
Institution: Butler University
Language: English
Subfield: Catalysis
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,935
OpenAlex ID: W4415638795