Hybrid compounds of Schiff base Cu, Fe, Co complexes with molybdovanadophoric heteropolyacids: synthesis, characterization and their catalytic performance to hydroxylation of benzene with H₂O₂

Abstract

Hybrid compounds of molybdovanadophoric heteropolyacids and a Schiff base transition metal complex, M‐saldmp or M‐fpdmp (M = Fe(II), Co(II), Cu(II)), were successfully prepared and found to be effective catalysts for direct hydroxylation of benzene with H2O2. The synergistic effect between Schiff base metal complex and heteropolyacid plays an important role in the promotion of catalytic activity. Copyright © 2012 John Wiley & Sons, Ltd.

Iron(iii) complexes of multidentate pyridinyl ligands: synthesis, characterization and catalysis of the direct hydroxylation of benzene

“…This correlation indicates that in the design of iron (Ⅲ)−based catalysts, increasing the electron-donating capability of a ligand to coordinate to Fe(Ⅲ) is certainly 90 beneficial. Although the conversion rate are comparable to the reported ones, 23,42,43 the selectivity is poor which is caused by over oxidation of the product. Therefore, how to avoid over oxidation becomes one of the major issues in designing Fe (Ⅲ)-based catalysts for the direct oxidation of benzene to phenol.…”

Efficient hydroxylation of aromatic compounds catalyzed by an iron(II) complex with H2O2

“…In the presence of H 2 O 2 , PGN (Fig. ) was used as an efficient catalyst for the direct hydroxylation of aromatic compounds, as iron complexes containing nitrogen and phenolic oxygen donor atoms have been widely used as efficient catalysts for hydroxylation of various substrates . The hydroxylation proved to proceed with the participation of the hydroxyl radical, as supported by density functional theory (DFT) calculations.…”

Synthesis and Characterization of Bio‐Inspired Diiron Complexes and Their Catalytic Activity for Direct Hydroxylation of Aromatic Compounds

“…[6] Among various catalysts for the selective hydroxylation of aromatic compounds, iron-based catalysts have been an active research area for many years, [7][8][9][10] because they catalyze a number of chemically challenging oxidative processes with high selectivity and reaction rates, [11,12] and because iron is geologically abundant. Especially, iron-based biomimetic catalysts with accessible redox states for selective oxygen binding and activation are studied to mimic the monoiron or diiron sites of the natural oxygenase enzymes (cytochrome P450, methane 1 the Fe-Fe bond in the model complexes were possible active oxidation sites, DFT calculations were used to investigate the oxygenated products, that is, the S-oxygenated products or the Fe-oxygenated forms of the model complexes, which may be involved in the catalytic cycle.…”