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Fourier transform-ion cyclotron resonance study of the gas-phase acidities of germane and methylgermane; bond dissociation energy of germane

✍ Scribed by Michèle Decouzon; Jean-François Gal; Jérôme Gayraud; Pierre-Charles Maria; Gian-Angelo Vaglio; Paolo Volpe

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
451 KB
Volume
4
Category
Article
ISSN
1044-0305

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✦ Synopsis

An accurate gas-phase acidity for germane (enthalpy scale, equivalent to the proton affinity of GeH3 (-)), ΔH acid (o)(GeH4) = 1502.0 ± 5.1 kJ mol(-1), is obtained by constructing a consistent acidity ladder between GeH4, and H2S by using Fourier transform-ion cyclotron resonance spectrometry, and 0 and 298.15 K values for the first bond dissociation energy of GeH4 are proposed: D0 (o)(H3Ge-H) = 352 ± 9 kJ mol(-1); D (o)(H3Ge-H) = 358 ± 9 kJ mol(-1), respectively. These results are compared with experimental and theoretical data reported in the literature. Methylgermane was found to be a weaker acid than germane by approximately 35 kJ mol(-1): ΔH acid (o) = 1536.6 kJ mol(-1).

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