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  • The standard molar enthalpy of sublimation ofη5-bis-pentamethylcyclopentadienyl iron measured with an electrically calibrated vacuum-drop sublimation microcalorimetric apparatus
  • Add time:07/31/2019         Source:sciencedirect.com

    A heat-flow Calvet microcalorimeter was adapted for the measurement of sublimation enthalpies by the vacuum-drop method, with samples of masses in the range 1 mg to 5 mg. The electrically calibrated apparatus was tested by determining the enthalpies of sublimation of benzoic acid and ferrocene, at T =  298.15 K. The obtained results, ΔcrgHmo(C7H6O2)  =  (88.3  ±  0.5)kJ · mol − 1and ΔcrgHmo(C10H10Fe) =  (73.3  ±  0.1)kJ · mol − 1, are in excellent agreement with the corresponding values recommended in the literature. Subsequent application of the apparatus to the determination of the enthalpy of sublimation of η5-bis-pentamethylcyclopentadyenyl iron, at T =  298.15 K, led to ΔcrgHmo(C20H30Fe)  =  (96.8  ±  0.6)kJ · mol − 1.

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