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Mass spectrometric determination of the dissociation energy of Mn 2 F 6 (g)
Author(s) -
Ciccioli Andrea,
Rau Julietta V.,
Balducci Giovanni,
Brutti Sergio,
Chilingarov Norbert N.,
Gigli Guido,
Cesaro Stella Nunziante
Publication year - 2002
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.754
Subject(s) - chemistry , vaporization , mass spectrometry , dissociation (chemistry) , knudsen number , enthalpy , vapor pressure , analytical chemistry (journal) , bond dissociation energy , standard enthalpy of formation , molecule , standard enthalpy change of formation , atmospheric temperature range , enthalpy of vaporization , thermodynamics , organic chemistry , chromatography , physics
The gaseous Mn 2 F 6 molecule has been identified for the first time in the vapor produced by MnF 3 vaporization and the MnF 3 (g) dimerization equilibrium studied by the Knudsen cell mass spectrometry technique in the 884–1015 K temperature range. The experimental vapor pressure data were treated by the second‐ and third‐law procedures, and the enthalpy of Mn 2 F 6 (g) dissociation has been determined as: $\font\mathbfit=cmmib10\def\bfit#1{\hbox{\mathbfit #1}} {\bf \Delta {\bfit H}_{0}^{o} [Mn_{2}F_{6}(g)] = 210.9 \pm 2.5 kJ/mol}$ . Thermodynamic functions of gaseous MnF 3 were calculated from geometrical and vibrational parameters taken from the literature. For gaseous Mn 2 F 6 , they were evaluated by comparison with molecular parameters of Co 2 F 6 (g). Copyright © 2002 John Wiley & Sons, Ltd.
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