Charge-Transfer Complexes in Kraft Lignin Part 2: Contribution to Color

Publisher Website
Google Scholar
Abstract
Chelation and removal of transition metals from the kraft lignin employed in this study did not reduce the lignin's visible absorbance. Likewise, hydrogenation of carbon-carbon double bonds in this lignin also had no effect on its visible spectrum. This indicated that extended conjugated systems were not a significant contributor to the color of this lignin. Of the structures investigated, quinones were found to be the major visible-light absorbing chromophores. Since a large component of the quinone's absorption results from their participation in charge-transfer complexes (CTC's),1 CTC's were a significant contributor to the color of this lignin.

This publication has 3 references indexed in Scilit: