Studies of e− + CO2 ⇌ CO2− equilibria in hexamethyldisiloxane and bis(trimethylsilyl) methane

Electrons react reversibly with CO2 in bis(trimethylsilyl)methane and hexamethyldisiloxane. This reaction is studied as a function of both temperature and pressure. The ground state energies of electrons are deduced and are quite low consistent with the observed high electron mobility. A linear dependence of the log of the attachment rate on the free energy of reaction is observed. The dependence of the equilibrium constant on pressure indicates the electrostriction volume of CO2− to be ≈−200 cm3/mol in these liquids.