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- W2091333698 abstract "Abstract A pulsed ion source has been designed and constructed for use with a Kratos MS 50 mass spectrometer in studies of ion-molecule reactions at total pressures from 1 to 5 torr at temperatures between 300 and 600 K. The source is demonstrated to be suited for the measurement of equilibrium constants as a function of temperature for proton-transfer reactions involving benzene and halogenated benzenes. The gas-phase basicity order C 6 H 5 F > C 6 H 5 Br, C 6 H 6 > C 6 H 5 Cl is established at 334 K and shown to he quite sensitive to temperature. Extrapolation of experimental data leads to C 6 H 6 > C 6 H 5 Cl > C 6 H 5 F above 850 K and to C 6 H 5 F > C 6 H 5 Cl > C 6 H 6 below 270 K. The standard enthalpy changes derived from van't Hoff plots indicate a proton affinity order C 6 H 5 F > C 6 H 5 Cl > C 6 H 6 which appears to be independent of temperature in the temperature range of the measurements. The standard entropy changes obtained from these plotsprovide insight into the site(s) of protonation Of C 6 H 5 F and C 6 H 5 Cl." @default.
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- W2091333698 date "1981-03-01" @default.
- W2091333698 modified "2023-09-25" @default.
- W2091333698 title "A determination of proton-transfer equilibrium constants in benzene/halobenzene mixtures at various temperatures using a high-pressure ion source" @default.
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- W2091333698 doi "https://doi.org/10.1016/0020-7381(81)80050-2" @default.
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