Figure 2.

(a) Donor number and dielectric constant (ε) of the different solvents investigated, along with optical images of vials containing 1.5 M and 0.1 mM nominal Li₂S₆ dissolved in each solvent. A clear blue color, indicative of the S₃^•− radical species, is predominant in DMA and DMSO at low concentrations.^{[5,15,16,18,19]} (b) UV-Vis spectra obtained for 0.25 M nominal Li₂S₆ (1.5 M of Sulfur) in DOL-DME, DMA, DMSO, and MeIm, with associated peak identification. ^{[16,17,22-24]}