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Infrared and Raman spectra of lignin substructures: Dibenzodioxocin
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-01-03 , DOI: 10.1002/jrs.5808
Peter Bock 1 , Paula Nousiainen 2 , Thomas Elder 3 , Markus Blaukopf 4 , Hassan Amer 5, 6 , Ronald Zirbs 7 , Antje Potthast 5 , Notburga Gierlinger 1
Affiliation  

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.

中文翻译:


木质素亚结构的红外和拉曼光谱:二苯并二氧辛



摘要 振动光谱是一种非常适合原位研究植物细胞壁的工具,几乎无需样品制备。所有不同成分的结构信息都包含在单个光谱中。因此,解释在很大程度上依赖于参考光谱和对所研究部件的振动行为的理解。我们首次展示了二苯并二氧辛 (DBDO)(一种重要的木质素子结构)的红外 (IR) 和拉曼光谱。支持信息中给出了基于量子化学计算的分子的详细振动分配;主要结果见论文。此外,我们还展示了合成愈创木基木质素(脱氢聚合物 - G-DHP)的红外和拉曼光谱。 DBDO 和 G-DHP 的拉曼光谱在激发波长方面都不同,因此揭示了子结构/聚合物的不同特征。这项研究证实了之前提出的想法,即 532 nm 拉曼选择性地探测木质素端基,而 785 nm 和红外拉曼似乎代表了大部分木质素亚结构。
更新日期:2020-01-03
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