Protolytic Properties of Phenols Related to Lignin in Electronically Excited States

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UDС

544.362:544.51

DOI:

Abstract

The acidity constants of some guaiacylic phenols, modeling the lignin macromolecule structural fragments in electronically excited (pKa*) were obtained using the methods of electronic absorption and luminescence spectroscopy methods based on the Foerster cycle. A significant decrease of pKa values of lignin related phenols under photoexcitation correlating with the properties of para-substitute towards phenolic hydroxyl group is shown.

Authors

N.S. Gorbova, K.G. Bogolitsyn, Institute of Ecological Problems of the North, Ural Branch, Russian Academy of Sciences D.S. Kosyakov, Arkhangelsk State Technical University

Affiliation

1Institute of Ecological Problems of the North, Ural Branch, Russian Academy of Sciences  2Arkhangelsk State Technical University

Keywords

lignin, phenols, electronically excited state, fluorescence, acidity constants.