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

AbstractAn accurate gas-phase acidity for germane (enthalpy scale, equivalent to the proton affinity of GeH−3), δ H°acid(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: D°0(H3G3-H) = 352 ± 9 kJ mol−1; D°(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: δ H°acid (MeGeH3) = 1536.6 kJ mol−1