Fluids for immersion cooling

An immersion cooling system comprising:

• a housing having an interior space;
• a heat-generating component disposed within the interior space;
• and
• a working fluid liquid disposed within the interior space such that the heat-generating component is in contact with the working fluid liquid;
• wherein the working fluid comprises a compound having Structural Formula (IA)
• wherein each Rf1 and Rf2 is, independently, (i) a linear or branched perhalogenated acyclic alkyl group having 1-6 carbon atoms and optionally contains one or more catenated heteroatoms selected from 0 or N;
• or (ii) a perhalogenated 5-7 membered cyclic alkyl group having 3-7 carbon atoms and optionally contains one or more catenated heteroatoms selected from O or N;
• and wherein the working fluid has a dielectric constant less than 2.5.