%0 Journal Article
%T Biomimetic Catalysts for Oxidation of Veratryl Alcohol, a Lignin Model Compound
%A Gustavo Gonz芍lez-Riopedre
%A Mar赤a Isabel Fern芍ndez-Garc赤a
%A Esther G車mez-F車rneas
%A Marcelino Maneiro
%J Catalysts
%D 2013
%I MDPI AG
%R 10.3390/catal3010232
%X Kraft pulp has to be bleached to eliminate the chromophoric structures, which cause a darkening of the pulp. In Nature, an equivalent role is assumed by ligninolytic enzymes such as lignin peroxidases, manganese peroxidases and laccases. The development of low molecular weight manganese peroxidase mimics may achieve environmentally-safe bleaching catalysts for the industry. Herein we report the synthesis and characterization of six manganese(III) complexes 1每 6, incorporating dianionic hexadentate Schiff base ligands (H 2L 1-H 2L 4) and different anions. Complex 4, Mn 2L 2 2(H 2O) 2(DCA) 2 was crystallographically characterized. Complexes 1每 4 behave as more efficient mimics of peroxidase in contrast to 5每 6. We have studied the use of these complexes as catalysts for the degradation of the lignin model compound veratryl alcohol. The biomimetic catalysts were used in conjunction with chlorine-free inexpensive co-oxidants as dioxygen or hydrogen peroxide. Yields up to 30% of veratryl alcohol conversion to veratraldehyde have been achieved at room temperature in presence of air flow using 0.5% of catalyst.
%K manganese
%K peroxidases
%K lignin
%K schiff bases
%K veratryl alcohol
%U http://www.mdpi.com/2073-4344/3/1/232