Effect of the N-based ligands in copper complexes for depolymerisation of lignin

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Several organic soluble N-based ligands and their copper complexes were firstly investigated as catalysts to depolymerise organosolv lignin in the organic solvent, dimethylformamide (DMF) and an ionic liquid (1-ethyl-3-methylimidazolium xylenesulfonate, [emim][ABS]). The results of screening depolymerisation reactions in DMF and [emim][ABS] showed that all the copper-amine complexes catalysed lignin depolymerisation more efficiently in ionic liquids than in DMF. Among the seven types of ligands, copper complexes with two types of ligands (E)-N-(pyridin-2-ylmethylene)aniline and (E)-4-methoxy-N-(pyridin-2-ylmethylene)aniline depolymerised the lignin more efficiently than the others. These two copper complexes with the N-based ligand were further studied to determine the most efficient conditions for the depolymerisation of the lignin. The most effective depolymerisation by conditions involved treatment at 180°C for 12 h in [emim][ABS]. Cyclic voltammetric studies were carried out to investigate the reversible potential associated with the copper centers of their complexes with these N-based ligands. The results suggest that two types of ligands have more positive reversible potentials than those of other copper complexes.

Original languageEnglish
Pages (from-to)3511-3519
Number of pages9
JournalNew Journal of Chemistry
Volume40
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016

Cite this

@article{578289671d594dda87a155d44240bc01,
title = "Effect of the N-based ligands in copper complexes for depolymerisation of lignin",
abstract = "Several organic soluble N-based ligands and their copper complexes were firstly investigated as catalysts to depolymerise organosolv lignin in the organic solvent, dimethylformamide (DMF) and an ionic liquid (1-ethyl-3-methylimidazolium xylenesulfonate, [emim][ABS]). The results of screening depolymerisation reactions in DMF and [emim][ABS] showed that all the copper-amine complexes catalysed lignin depolymerisation more efficiently in ionic liquids than in DMF. Among the seven types of ligands, copper complexes with two types of ligands (E)-N-(pyridin-2-ylmethylene)aniline and (E)-4-methoxy-N-(pyridin-2-ylmethylene)aniline depolymerised the lignin more efficiently than the others. These two copper complexes with the N-based ligand were further studied to determine the most efficient conditions for the depolymerisation of the lignin. The most effective depolymerisation by conditions involved treatment at 180°C for 12 h in [emim][ABS]. Cyclic voltammetric studies were carried out to investigate the reversible potential associated with the copper centers of their complexes with these N-based ligands. The results suggest that two types of ligands have more positive reversible potentials than those of other copper complexes.",
author = "Jinhuo Dai and Nanayakkara, {Sepa Yasandrika} and Thomas Lamb and Andrew Clark and SiXuan Guo and Jie Zhang and Patti, {Antonio F.} and Kei Saito",
year = "2016",
month = "4",
day = "1",
doi = "10.1039/c5nj03152d",
language = "English",
volume = "40",
pages = "3511--3519",
journal = "New Journal of Chemistry",
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publisher = "The Royal Society of Chemistry",
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Effect of the N-based ligands in copper complexes for depolymerisation of lignin. / Dai, Jinhuo; Nanayakkara, Sepa Yasandrika; Lamb, Thomas; Clark, Andrew; Guo, SiXuan; Zhang, Jie; Patti, Antonio F.; Saito, Kei.

In: New Journal of Chemistry, Vol. 40, No. 4, 01.04.2016, p. 3511-3519.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Effect of the N-based ligands in copper complexes for depolymerisation of lignin

AU - Dai, Jinhuo

AU - Nanayakkara, Sepa Yasandrika

AU - Lamb, Thomas

AU - Clark, Andrew

AU - Guo, SiXuan

AU - Zhang, Jie

AU - Patti, Antonio F.

AU - Saito, Kei

PY - 2016/4/1

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N2 - Several organic soluble N-based ligands and their copper complexes were firstly investigated as catalysts to depolymerise organosolv lignin in the organic solvent, dimethylformamide (DMF) and an ionic liquid (1-ethyl-3-methylimidazolium xylenesulfonate, [emim][ABS]). The results of screening depolymerisation reactions in DMF and [emim][ABS] showed that all the copper-amine complexes catalysed lignin depolymerisation more efficiently in ionic liquids than in DMF. Among the seven types of ligands, copper complexes with two types of ligands (E)-N-(pyridin-2-ylmethylene)aniline and (E)-4-methoxy-N-(pyridin-2-ylmethylene)aniline depolymerised the lignin more efficiently than the others. These two copper complexes with the N-based ligand were further studied to determine the most efficient conditions for the depolymerisation of the lignin. The most effective depolymerisation by conditions involved treatment at 180°C for 12 h in [emim][ABS]. Cyclic voltammetric studies were carried out to investigate the reversible potential associated with the copper centers of their complexes with these N-based ligands. The results suggest that two types of ligands have more positive reversible potentials than those of other copper complexes.

AB - Several organic soluble N-based ligands and their copper complexes were firstly investigated as catalysts to depolymerise organosolv lignin in the organic solvent, dimethylformamide (DMF) and an ionic liquid (1-ethyl-3-methylimidazolium xylenesulfonate, [emim][ABS]). The results of screening depolymerisation reactions in DMF and [emim][ABS] showed that all the copper-amine complexes catalysed lignin depolymerisation more efficiently in ionic liquids than in DMF. Among the seven types of ligands, copper complexes with two types of ligands (E)-N-(pyridin-2-ylmethylene)aniline and (E)-4-methoxy-N-(pyridin-2-ylmethylene)aniline depolymerised the lignin more efficiently than the others. These two copper complexes with the N-based ligand were further studied to determine the most efficient conditions for the depolymerisation of the lignin. The most effective depolymerisation by conditions involved treatment at 180°C for 12 h in [emim][ABS]. Cyclic voltammetric studies were carried out to investigate the reversible potential associated with the copper centers of their complexes with these N-based ligands. The results suggest that two types of ligands have more positive reversible potentials than those of other copper complexes.

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