Experimental determination of heats of formation of negative ions and electron affinities of several boron and aluminium fluorides
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 70, 1033-1038
- https://doi.org/10.1039/f19747001033
Abstract
Thermodynamic properties for the negative ions of boron and aluminium fluorides were obtained by means of the effusion-mass spectrometric method over the temperature range 1100 to 1900 K. Studies were conducted involving negative ions with neutral molecules for the isomolecular reactions BF– 2(g)+ F(g)→BF2(g)+ F–(g), BF3(g)+ BF– 2(g)→BF(g)+ BF– 4(g), AlF2(g)+ F–(g)→AlF– 2(g)+ F(g) and 2AlF2(g)+ AlF– 2(g)→2AlF(g)+ AlF– 4(g). The heats of formation, ΔHf298, for the ions BF– 2(g), AlF– 2(g), AlF– 4(g), and BF– 4(g) obtained from the reaction thermodynamics were – 191.7 ± 3, – 232.1 ± 3, – 500 ± 3 and – 433 kcal mol–1, respectively. The electron affinities for BF2 and AlF2 were 50.7 ± 3 and 53.1 ± 3 kcal mol–1, respectively.Keywords
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