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A new hydrophobic deep eutectic solvent based on D2EHPA and TOPO: synthesis and properties.
* 1 , 2 , 3 , 2 , 2
1  Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, Russia
2  Kurnakov Institute of General and Inorganic Chemistry, RAS.
3  Kurnakov Institute of General and Inorganic Chemistry, RAS
Academic Editor: Gade Pandu Rangaiah


A new hydrophobic eutectic solvent based on trioctylphosphine oxide and di-(2-ethylhexyl)phosphoric acid was obtained. The formation of HDES was confirmed by NMR and IR spectroscopy. The physical properties of the synthesized HDES were studied: density, shear and dynamic viscosity, refractive index in the range of 15-60°C. Using the method of differential scanning calorimetry, the thermal stability of HDES was studied and a phase diagram was obtained in various molar ratios. The possibility of its use as an extractant for the extraction of transition metal ions in a heterogeneous liquid-liquid system, as well as the possibility of their separation, was studied.

Keywords: deep eutectic solvent, di-(2-ethylhexyl)phosphoric acid, trioctylphosphine oxide, metal extraction, liquid-liquid extraction