The standard molar enthalpy of sublimation ofη5-bis-pentamethylcyclopentadienyl iron measured with an electrically calibrated vacuum-drop sublimation microcalorimetric apparatus
✍ Scribed by Tetsu Kiyobayashi; Manuel E. Minas da Piedade
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 203 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0021-9614
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✦ Synopsis
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, g cr H o m (C 7 H 6 O 2 ) = (88.3 ± 0.5) kJ • mol -1 and g cr H o m (C 10 H 10 Fe) = (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 η 5 -bis-pentamethylcyclopentadyenyl iron, at T = 298.15 K, led to g cr H o m (C 20 H 30 Fe) = (96.8 ± 0.6) kJ • mol -1 .