Recent results support the assumption that hydroquinones (e.g., methoxyhydroquinone, MHQ), benzoquinones (e.g., methoxy-[1,4]benzoquinone, MBQ; 2,5-dihydroxy-[1,4]benzoquinone, DHBQ), and quinone imines (e.g., 2,5-dihydroxy-[1,4]benzoquinone imine, DHBQI) are pivotal compounds in the oxidative degradation of ligneous materials and in the formation of nitrogenous oligo- and polymeric materials. Furthermore, DHBQ is able to bind CO2 under neutral aqueous conditions, forming quinone carboxylic acids and subsequently stable products. In addition, DHBQIs have a considerable CO2-binding potential as (1) the transition state of the electrophilic addition of CO2 to the respective dianion has a similarly low activation energy as in the case of DHBQ and (2) the tautomeric 2,5-diamino-[1,4]benzoquinone, DABQ) has the tendency to form ion-pair complexes.
CITATION STYLE
Liebner, F., Wieland, M., Hosoya, T., Pour, G., Potthast, A., & Rosenau, T. (2013). CO2 sequestration by humic substances and the contribution of quinones and quinone imines: Consideration on the molecular scale. In Functions of Natural Organic Matter in Changing Environment (Vol. 9789400756342, pp. 371–376). Springer Netherlands. https://doi.org/10.1007/978-94-007-5634-2_67
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