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Catalytic oxidation of lignin to aromatics over salen-porphyrin complex as a biomimetic catalyst

Lu Xu-Jie, Zhou Xue-Fei, Zhu Zheng-Liang, Sun Yali, Tang Kai, Lei Fu-Hou, Liu Zu-Guang, Wang Ting

Drewno : prace naukowe, doniesienia, komunikaty

2019

vol. 62, nr 203

67--80

The aim of this work is to enable increased production of aromatics by the use of salen-porphyrin complex (ZnPSC6) as a binuclear catalyst for the catalytic oxidation of Indulin AT lignin. Catalytic activity was enhanced by the increase in active sites, as confirmed by the results observed in the conversion of lignin model compounds and Indulin AT lignin compared with processes using the mononuclear complexes Zn(salen) and Zn(Phe-TPP). The yields of long and convoluted aromatics from the catalytic oxidation of Indulin AT lignin with ZnPSC6 reached high values after reaction at 80°C for 24 h. Notably, the formation of vanillin was promoted by the increase in active sites over ZnPSC6. This was followed by a significant decrease of β-O-4 linkages and refractory condensed substructures in the lignin, induced by ZnPSC6. This may be expected to be an important area for further study.

Synthesis and Spectroscopic Investigation of Binuclear Copper(II), Cobalt(II), Nickel(II), Manganese(II), Zinc(II) and Cadmium(II) Complexes Derived from N,N'-Bis(2-carboxylphenyl)-2,6-pyridinedicarboxamide

Gudasi K., Patil S., Vadavi R., Shenoy R., Patil M.

Polish Journal of Chemistry

2006

Vol. 80, nr 2

247-257

A new amide ligand, N,N'-bis(2-carboxylphenyl)-2,6-pyridinedicarboxamide (BCPD), formed by the condensation of 2,6-pyridine dicarbonyldichloride with 2-aminobenzoic acid has been structurally characterized. Binuclear Cu(II), Co(II), Ni(II), Mn(II), Zn(II) and Cd(II) complexes have been synthesized for the first time. Their structures have been elucidated on the basis of elemental analyses, conductance measurement, magnetic moment, spectral (IR,NMR,UV-Vis, EPR and FAB) and thermal studies. Infrared spectra of the complexes indicate the participation of uncharged amide oxygen atoms, pyridine nitrogen and carboxylic acid groups in a chelating bidentate fashion via deprotonation. The studies reveal that both the metal ions are present in an octahedral environment. Non-electrolytic nature of the complexes is evidenced by their low conductance data. X-band EPR spectra of the binuclear Cu(II) and Mn(II) complexes in polycrystalline state at room temperature and liquid nitrogen temperature were recorded and their salient features are reported. Thermal stabilities of the Zn(II) and Cd(II) complexes have been studied.