Mass spectrometric determination of cobalt trifluoride saturated vapor pressure. Enthalpy of formation of gaseous CoF4 and CoF4−

✍ Scribed by J. V. Rau; N. S. Chilingarov; L. N. Sidorov

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 81 KB
• Volume: 11
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(199712)11:18<1977::aid-rcm808>3.0.co;2-j

✦ Synopsis

Knudsen cell mass spectrometry has been used for measuring the saturated vapor pressure of cobalt trifluoride. Enthalpy of sublimation of cobalt trifluoride, AE 8 H 0 (CoF 3 ,0 K), has been determined as 213.7 ± 11.0 kJ/mol. Enthalpies of formation of the gaseous molecules CoF 3 , CoF 4 , and of the anion CoF 4 -, AE f H 0 (0 K), have been recalculated as -572.3 ± 32.0, -649.0 ± 32.3 and -1265.3 ± 40.6 kJ/mol, respectively. The electron affinity of cobalt tetrafluoride, EA(COF 4 ), was found to be 6.4 ± 0.3 eV.