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Subject: search.filters.subject.Fluorine Compounds

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    Thermodynamic properties of fluorine compounds: Part 14.—Low-temperature heat capacity and entropy of octafluorotolune
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Andon, Richard J. L.; Martin, John F.
    The heat capacity between 10 and 365 K, the enthalpy of fusion, and the triple-point temperature of octafluorotoluene have been measured. The standard entropy of the ideal gas has been obtained from the results of the measurements and other data.
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    Thermodynamic Properties of Fluorine Compounds: Part 12.Low-temperature Heat Capacity and Entropy of 1,3,5-Trichloro-2,4,6-trifluorobenzene
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1973, 69 (5), 1973) Andon, Richard J. L.; Martin, John F.
    The heat capacity of 1,3,5-trichloro-2,4,6-trifluorobenzene was measured by adiabatic calorimetry from 14 to 347 K, and thermodynamic functions were calculated from the results. The heat capacity curve exhibited an anomalous region between 285 and 305 K. The triple point temperature was measured as 335.01 K and the entropy of the crystals at 298.15 K was found to be 243.3 J K–1 mol–1.
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    Thermodynamic Properties of Fluorine Compounds: Part ll.1—Low-temperature Heat Capacities of the Three Tetrafluorobenzenes
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1973, 69 (4), 1973) Andon, R. J. L.; Martin, J. F.
    The heat capacities of 1,2,3,4-, 1,2,3,5- and 1,2,4,5-tetrafluorobenzene were measured by adiabatic calorimetry at temperatures between 11 and 353 K. Enthalpies of phase transitions were also measured. The entropies of the liquids at 298.15 K were calculated from the measurements as 256.1, 257.3 and 250.4 3 K-1 mol-1 respectively. The heat capacity curve for 1,2,3,5-tetrafluoro- benzene showed that a transition occurred in the crystals just below the melting temperature. 1,2,3,4- tetrafluorobenzene crystallised first in a metastable form which, on cooling, rapidly transformed to stable crystals. No anomalies were found in the heat capacity curve of 1,2,4,5-tetrafluorobenzene.