Catalytic activity and stability of iron hexacyanocobaltate (FeIII[CoIII(CN)6], Fe–Co) for organophosphate hydrolysis are improved by doping divalent metal ions (MII = MnII, NiII, or CuII). The catalytic a series (FeIII0.8MII0.3)[CoIII(CN)6] (FeM–Co compounds) was examined in mixed solution water ethanol [9:1 (v/v)] containing disodium p-nitrophenyl phosphate (p-NPP) at 60 °C. FeM–Co compounds ...

We have previously reported that bacterial flavohemoglobin (HMP) catalyzes both a rapid reaction of heme-bound O(2) with nitric oxide (NO) to form nitrate [HMP-Fe(II)O(2) + NO --> HMP-Fe(III) + NO(3)(-)] and, under anaerobic conditions, a slower reduction of heme-bound NO to an NO(-) equivalent (followed by the formation of N(2)O), thereby protecting against nitrosative stress under both aerobi...

Layered FeII-FeIII hydroxides (green rusts, GRs) are efficient reducing agents against oxidizing contaminants such as chromate, nitrate, selenite, and nitroaromatic compounds and chlorinated solvents. In this study, we adopted a buffered precipitation approach where glycine (GLY) was used in the synthesis of sulfate-interlayered GR (GRSO4) by aerial oxidation of FeII or co-precipitation by addi...

The acetic acid-catalyzed reaction between 5-chloro-isatin and 4-methyl-thio-semicarbazide yields the title compound, C10H9ClN4OS (I) (common name: 5-chloro-isatin-4-methyl-thio-semicarbazone). The mol-ecule is nearly planar (r.m.s. deviation = 0.047 Å for all non-H atoms), with a maximum deviation of 0.089 (1) Å for the O atom. An S(6) ring motif formed by an intra-molecular N-H⋯O hydrogen bon...

Treatment of met-myoglobin (FeIII) with H2O2 gives rise to ferryl myoglobin, which is closely related to compound II in peroxidases. Experimental studies have given conflicting results for this species. In particular, crystallographic and extended x-ray absorption fine-structure data have shown either a short (approximately 170 pm) or a longer (approximately 190 pm) Fe-O bond, indicating either...

cyclic voltammogram and differential pulse polarograph of octaethyl porphyrin iron(iii) chloride in dichloromethane was investigated in the presence of pyridine, imidazole and collidine. values of e1/2 for feiii/feii redox reaction were monitored as a function of axial group concentration, and on the basis of these data, an overall oxidation-reduction and ligand addition scheme was formulated. ...

The synthesis and structural characterization of a nonanuclear FeIII cage complex is reported. The nine iron centers in [Fe9(mu3-O)4(O3PPh)3(O2CCMe3)13] lie on the vertices of an incomplete icosahedron, with the P atoms of triphenylphosphonate at the other three vertices. The paramagnetic core therefore describes a tridiminished icosahedron. Magnetic studies suggest an S=1/2 ground state for th...

Bacterial NOR (nitric oxide reductase) is a major source of the powerful greenhouse gas N2O. NorBC from Paracoccus denitrificans is a heterodimeric multi-haem transmembrane complex. The active site, in NorB, comprises high-spin haem b3 in close proximity with non-haem iron, FeB. In oxidized NorBC, the active site is EPR-silent owing to exchange coupling between FeIII haem b3 and FeBIII (both S=...