Synthesis, molecular structure and antioxidant activity of bis [L(μ-chloro)copper(II)] supported by phenoxy/naphthoxy-imine ligands.

A new series of Cu(II) complexes [bis[{(μ-chloro)-2-MeO-Ph-CH-(N=CH)-2,4-tert-butyl-2-OCH)}Cu(II)] (Cu1); bis[{(μ-chloro)-2-MeS-Ph-CH-(N=CH)-2,4-tert-butyl-2-(OCH)}Cu(II)] (Cu2); bis[{(μ-chloro)-2-MeO-Ph-CH-(N=CH)-2-(OCH)} Cu(II)] (Cu3); bis[{(μ-chloro)-2-MeS-Ph-CH-(N=CH)-2-(OCH)}Cu(II)] complex (Cu4); bis[{2-MeS-Ph-CH-(N=CH)-2,4-tert-butyl-2-(OCH)}Cu(II)] (Cu5)] have been synthesized and characterized by elemental analysis, IR, UV-Visible and by X-ray crystallography for Cu1, Cu4 and Cu5. In the solid state, Cu1 features of a chloro-bridged dimer complex with κ coordination of the monoanionic phenoxy-imine ligand onto the copper center. On the other hand, the molecular structure of Cu4 reveals the naphthoxy-imine ligand with pendant S-group coordinated to the copper atom in tridentate meridional fashion.

Effect of autohydrolysis on Pinus radiata wood for hemicellulose extraction.

The extraction of hemicellulose from pine wood was studied by applying autohydrolysis treatment. A central composite experimental design was carried out using different temperatures (150-190 °C) and times (30-90 min) to select the most favorable operating conditions for maximizing the extraction of hemicellulose and minimizing its degradation. This liquid phase was analyzed by HPLC to quantify oligosaccharides, monosaccharides and degradation products.

Combining autohydrolysis and ionic liquid microwave treatment to enhance enzymatic hydrolysis of Eucalyptus globulus wood.

The combination of autohydrolysis and ionic liquid microwave treatments of eucalyptus wood have been studied to facilitate sugar production in a subsequent enzymatic hydrolysis step. Three autohydrolysis conditions (150 °C, 175 °C and 200 °C) in combination with two ionic liquid temperatures (80 °C and 120 °C) were compared in terms of chemical composition, enzymatic digestibility and sugar production. Morphology was measured (using SEM) and the biomass surface was visualized with confocal fluorescence microscopy.