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- W2024405416 abstract "The reaction of excess electrons with pyrimidine and styrene was studied in supercritical ethane. The equilibrium constant for attachment was large when the solute was pyrimidine and small for styrene, although their electron affinities are comparable. At pressures above 100 bar, the rate constant for electron attachment to pyrimidine (ka) was time resolved using the short pulse of the laser-electron accelerator facility (LEAF). The rate constant, ka, is large and nearly independent of pressure and temperature; thus, the volume of activation is close to zero. At lower pressures, the equilibrium constants for this reaction were derived from the changes in the mobility of excess electrons. The free energy is a function of the polarization energy, which was evaluated with a compressible continuum model. The small equilibrium constant in the case of styrene is attributed to a smaller polarization energy. Values of ΔVr, obtained from changes of ΔGr with pressure, range from −9.0 to −0.4 L/mol. The observed volume changes are compared to electrostriction volumes calculated by the model. Electron attachment occurs with a large decrease in entropy associated with clustering of ethane molecules around the ion formed. Observed values of ΔSr are comparable to expected values calculated from ΔSr = (α/χT)ΔVr." @default.
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- W2024405416 date "1999-06-19" @default.
- W2024405416 modified "2023-10-16" @default.
- W2024405416 title "Thermodynamics of Electron Attachment to Pyrimidine and Styrene in Supercritical Ethane" @default.
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- W2024405416 doi "https://doi.org/10.1021/jp990717c" @default.
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