Eutectic solvents were prepared by mixing appropriate amounts of individual solid components into a 5 mL Eppendorf-tube, typically a total weight of 2 g. Melting was assisted by heating inside an oven at 60°C for 15 minutes, which was followed by a brief vortex-mixing. All solvent mixtures (eutectic or non-eutectic) reported below are defined by their weight ratios. Solvents were stored at room temperature and darkness.