Abstract
AbstractThe thermodynamic data of formation of aromatic radical anions from nine different aromatic hydrocarbons and solvated electrons in ammonia are determined by potentiometric titration with a suitable electrochemical cell without diffusion potential. As expected a linear relationship is obtained between ΔHR0 and ΔGR0 of the electron attachment reaction and the energy parameter of the MO‐theory for the hydrocarbons — Via a Haber‐Born‐cycle the solvation enthalpy and solvation entropy of the electrons are obtained under the assumption that the solvation effects of the aromatic hydrocarbons and their radical anions can be estimated as the electrostatic effects of charging a spheric particle in the dielectricum ammonia. Due to the structure breaking action of the solvated electrons ΔH0 = −89 ± 9 kj/mol ΔS0 = 175 ± 25 J/mol · K are appreciable more positive than for normal univalent ions in ammonia.
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