Synthesis And Physico-chemical Properties Ofamino-functionalized Ionic Liquids

Ionic liquids （ILs） is a kind of organic salt which was fluid around room temperature and composedwith cations and anions. Considering so many different cations and anions, at least1018ILs are potentiallypossible. ILs are not only regarded as a kind of novel and green solvents, but a kind of functional materialswhich are widely used in catalytic, organic synthesis, separations, electrochemistry, and so on. New kind ofionic liquids and expanding ILs’s applications are always the main research direction.synthesis and application of amino functioned ILs are investigated as follows:（1） Three quaternary ammonium-amino acid ionic liquids were chosen and synthesized:tetraethylammonium L-α-aminopropionic acid salt ([N₂₂₂₂][Ala]), tetraethylammoniumL-amino-3-hydroxypropionic acid salt ([N₂₂₂₂][Ser]), tetraethylammonium L-aminosuccinic acidsalt ([N₂₂₂₂][Asp]). The structure was characterized by1H NMR and13C NMR.（2） The physicochemical properties （density, viscosity, conductivity and decomposition point） of theamino-functionalized tetraethylammonium ILs ([N₂₂₂₂][AA]) were characterized systematically.（3） The physicochemical properties （density, viscosity and conductivity） of binary mixture([N₂₂₂₂][AA]+H2O/Glycol) with different compositions were determined at T=293.15-343.15Ksystematically. The excess volume, excess viscosity, and molar conductivity were calculated. Theinteraction between ILs and solvents were analysised. The excess volume and excess viscositywere correlated respectively.