Infrared and Raman spectra of lignin substructures : Dibenzodioxocin

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http://hdl.handle.net/10138/313195

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Bock , P , Nousiainen , P , Elder , T , Blaukopf , M , Amer , H , Zirbs , R , Potthast , A & Gierlinger , N 2020 , ' Infrared and Raman spectra of lignin substructures : Dibenzodioxocin ' , Journal of Raman Spectroscopy , vol. 51 , no. 3 , pp. 422-431 . https://doi.org/10.1002/jrs.5808

Title: Infrared and Raman spectra of lignin substructures : Dibenzodioxocin
Author: Bock, Peter; Nousiainen, Paula; Elder, Thomas; Blaukopf, Markus; Amer, Hassan; Zirbs, Ronald; Potthast, Antje; Gierlinger, Notburga
Contributor: University of Helsinki, Department of Chemistry
Date: 2020-03
Language: eng
Number of pages: 10
Belongs to series: Journal of Raman Spectroscopy
ISSN: 0377-0486
URI: http://hdl.handle.net/10138/313195
Abstract: Vibrational spectroscopy is a very suitable tool for investigating the plant cell wall in situ with almost no sample preparation. The structural information of all different constituents is contained in a single spectrum. Interpretation therefore heavily relies on reference spectra and understanding of the vibrational behavior of the components under study. For the first time, we show infrared (IR) and Raman spectra of dibenzodioxocin (DBDO), an important lignin substructure. A detailed vibrational assignment of the molecule, based on quantum chemical computations, is given in the Supporting Information; the main results are found in the paper. Furthermore, we show IR and Raman spectra of synthetic guaiacyl lignin (dehydrogenation polymer-G-DHP). Raman spectra of DBDO and G-DHP both differ with respect to the excitation wavelength and therefore reveal different features of the substructure/polymer. This study confirms the idea previously put forward that Raman at 532 nm selectively probes end groups of lignin, whereas Raman at 785 nm and IR seem to represent the majority of lignin substructures.
Subject: lignin
dibenzodioxocin
Raman spectroscopy
FT-IR
dehydrogenation
polymer
PLANT-CELL WALLS
CHEMICAL-CHANGES
MODEL COMPOUNDS
WOOD
CONJUGATION
INTENSITY
SPECTROSCOPY
ALCOHOL
SPRUCE
116 Chemical sciences
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