What biosolvents could, in theory, permit the emergence of life on other worlds? I have been recently looking through possible biosolvents and I have found a good number, but I am specifically looking for more esoteric or less common solvents or thalassogens. Something like Liquid Iron Pentacarbonyl or Molten Sodium Chloride. These two have been discussed here, but I am mostly looking for solvents that have not really been proposed in a published work or explored very well. I am just looking for a brief description of why the fluid might act as a good solvent for life and what element or compound could serve as the backbone, would it be carbon-based life? Tungsten-Chloride-based life? I just want it to be at least theoretically possible (it doesn't have to be plausible) at least so my story has scientific grounding. I am mostly looking for brand new solvent possibilities that even have not been proposed here, but I would be happy to learn more about solvents that are somewhat known like hydrogen cyanide. I am just asking for a simple list with brief explanations or overviews.
The National Academy of Science has a report "The Limits of Organic Life in Planetary Systems" and they discuss water as a solvent, but then also go on to consider several other potential solvents and mediums for life. They have a fairly extensive list that they divide into three groups solvents into three groups: polar solvents that are not water, nonpolar solvents, and cryosolvents. They have short discussions on
Polar solvents: Ammonia, Sulfuric Acid, Formamide (HCONH2)
Nonpolar Solvents: Mainly hydrocarbons - methane, ethane, propane, butane, and so on
Cryosolvents: dihydrogen, dinitrogen, and supercritical CO2