Abstract
2,6-Di-tert-butylpyridine (DTBP) is widely used in ion mobility spectrometry and its combination with mass spectrometry as a standard compound for the calibration of the ion mobility scale. In this work, we computed the structure and determined the conformational composition of DTBP and products of its protonation using quantum chemical methods. We found three conformers of DTBP with similar stabilities. We showed that their protonation leads to three products with similar stabilities. The proton affinity and ga--s-phase basicity of DTBP were calculated. The thermodynamic parameters of DTBP reactions with hydrated hydroxonium ions H3O+(H2O)n (n = 0–3) were computed. The calculations confirmed that, in agreement with the experimental data, the reactions lead to the formation of protonated DTBP molecules that are not hydrated and do not form proton-bound dimers. We showed that the peculiarities of DTBP protonation are substantially due to the steric effect of tert-butyl groups. The reduced mobility of protonated DTBP molecules was calculated by the trajectory method. The calculation error is close to the experimental one. According to the experimental data, the calculated reduced mobilities do not significantly change with temperature.
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Lebedev, A.V. Peculiarities of 2,6-Di-tert-butylpyridine Protonation: Mobility of Protonated Molecules. J Anal Chem 76, 1538–1548 (2021). https://doi.org/10.1134/S1061934821130074
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DOI: https://doi.org/10.1134/S1061934821130074