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 language | English |
|---|---|
| Pages (from-to) | 3511-3519 |
| Number of pages | 9 |
| Journal | New Journal of Chemistry |
| Volume | 40 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Apr 2016 |
Cite this
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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 journal › Article › Research › peer-review
TY - JOUR
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
Y1 - 2016/4/1
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.
UR - http://www.scopus.com/inward/record.url?scp=84964599978&partnerID=8YFLogxK
UR - http://pubs.rsc.org.ezproxy.lib.monash.edu.au/en/content/articlepdf/2016/nj/c5nj03152d
U2 - 10.1039/c5nj03152d
DO - 10.1039/c5nj03152d
M3 - Article
AN - SCOPUS:84964599978
VL - 40
SP - 3511
EP - 3519
JO - New Journal of Chemistry
JF - New Journal of Chemistry
SN - 1144-0546
IS - 4
ER -