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Gas-phase basicities of the isomeric dihydroxybenzoic acids and gas-phase acidities of their radical cations

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Journal of the American Society for Mass Spectrometry

Abstract

The thermochemical acid/base properties of the six dihydroxybenzoic acids (x,y-DHB) as prototypical matrices used in matrix-assisted laser desorption/ionization (MALDI) have been investigated. The ground-state gas-phase basicities (GB) of the six DHB isomers and the gas-phase acidities (ΔGacid) of the corresponding radical cations ([x,y-DHB].+) have been determined by Fourier-transform ion cyclotron resonance mass spectrometry employing the thermokinetic method. The gas-phase basicities vary from 814 kJ mol−1 for the least basic isomer, 3,5-DHB, to 831 kJ mol−1 for the most basic isomer, 2,4-DHB. The obtained gas-phase acidities of the corresponding radical cations vary from 815 kJ mol−1 for the most acidic species, 3,4-DHB, to 858 kJ mol−1 for the least acidic one, 2,5-DHB. The results indicate that ground-state proton transfer from the matrix radical cations to the analyte may play a role in the ionization process of MALDI, whereas proton transfer from protonated matrix molecules can be excluded.

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Authors and Affiliations

  1. Lehrstuhl I für Organische Chemie, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615, Bielefeld, Germany

    Michael Mormann & Dietmar Kuck

  2. Institute of Mass Spectrometry, Department of Chemistry, University of Warwick, Coventry, UK

    Sajid Bashir & Peter J. Derrick

  3. Fachbereich für Chemie und Chemietechnik, Paderborn, Germany

    Dietmar Kuck

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  1. Michael Mormann
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  2. Sajid Bashir
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  4. Dietmar Kuck
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Correspondence to Dietmar Kuck.

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Mormann, M., Bashir, S., Derrick, P.J. et al. Gas-phase basicities of the isomeric dihydroxybenzoic acids and gas-phase acidities of their radical cations. J Am Soc Mass Spectrom 11, 544–552 (2000). https://doi.org/10.1016/S1044-0305(00)00112-4

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  • DOI: https://doi.org/10.1016/S1044-0305(00)00112-4

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