The multi-frequency high-field electron paramagnetic resonance (HFEPR) was used to study the magnetic properties of malarial pigment hemozoin and its synthetic analogue, beta-hematin. (FeIII-protoporphyrin-IX)2 dimers containing five-coordinate high-spin FeIII, S = 5/2, are the building blocks of these pigments. The fit of EPR spectra that were acquired in an unprecedented wide range of microwa...

Superoxide reduction by thiolate-ligated [FeII(SMe2N4(tren))]+ (1) involves two proton-dependent steps and a single peroxide intermediate, [FeIII(SMe2N4(tren))(OOH)]+ (2). An external proton donor is required, ruling out mechanisms involving H+ or H-atom abstraction from the ligand N-H. The initial protonation step affording 2 occurs with fairly basic proton donors (EtOH, MeOH, NH4+) in THF. Mo...

Abstract. Iron(III) carboxylate photochemistry plays an important role in aerosol aging, especially the lower troposphere. These complexes can absorb light over a broad wavelength range, inducing reduction of iron(III) and oxidation ligands. In presence O2, ensuing radical chemistry leads to further decarboxylation, production .OH, HO2., peroxides, oxygenated volatile organic compounds, contrib...

Although fullerene (C60) has attracted great interest as a carbon-based nanomaterial with unique properties, today, little is known about the interaction of its water-soluble derivates, including fullerenol higher plants. Here, we investigated how [C60(OH)22-24] affects Zea mays, Strategy II plant, depending on iron status. Iron deficiency chlorosis common nutritional disorder affecting Maize p...

The reaction of Fe(NCS)3 prepared in situ in MeOH with Hqsal-X (Hqsal-X = 5-X-N-quinolylsalicylaldimine) in CH2Cl2 yields the FeIII complexes, [Fe(qsal-X)2]NCS·solvent (X = F 1; X = Cl, 2, Br, 3 solvent = MeOH; X = I, solvent = 0.25CH2Cl2·0.5MeOH 4) in moderate to good yields. IR spectroscopy confirms that NCS− acts as a counteranion only and that the qsal-X ligand is bound to the FeIII centre....

Iron-catalyzed isomerization of alkenes is reported using an iron(II) ?-diketiminate pre-catalyst. The reaction proceeds with a catalytic amount hydride source, such as pinacol borane (HBpin) or ammonia (H3N?BH3). Reactivity both allyl arenes and aliphatic has been studied. mechanism was investigated by variety means, including deuteration studies, Density Functional Theory (DFT) Electron Param...

The massive worldwide use of antibiotics leads to water pollution and increasing microbial resistance. Hence, the removal antibiotic residues is a key issue in remediation. Here, we report solar light-assisted oxidative degradation ciprofloxacin (CPF), using H2O2 aqueous solution, catalyzed by iron(III) chelated cross-linked chitosan (FeIII-CS-GLA) immobilized on glass plate. FeIII-CS-GLA catal...