The standard molar enthalpy of sublimation ofη5-bis-pentamethylcyclopentadienyl iron measured with an electrically calibrated vacuum-drop sublimation microcalorimetric apparatus
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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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