Fe-containing compounds

Tabuchi et al. " reported that the solvothermal reaction of a mixture of a-NaFe02 (obtained by hydrothermal reaction of a-FeOOH with NaOH) and LiCl in ethanol at 220°C for 96 h yielded an Fe +-containing compound with the formula of Lli. Fes+ Os with an inverse spinel stracture. 

The impregnation of fluorine-containing gels by the acetone solution of FeCh and subsequent thermal treatment at 1200°C in air results in the formation of fluorinated Fe-containing compounds in the form of nanosize amorphous clusters, dispersed in the matrix of silica-like opalescence material. 

Refractories are ceramics, including bricks destined for use in ovens, electric insulators, etc., which must withstand rather high temperatures. To that effect refractory ceramics may not contain compounds that melt at the temperatures at which they are destined to be used. In particular Fe-containing compounds must be avoided. The major clay varieties used for refractories are kaolinite, quartz and illite. Here also the more finely divided varieties of illites in particular, are best avoided (van Oss and van Oss, 1956). Firing of refractories requires temperatures of the order of 1500-1600°C. 

Nitrates. Iron(II) nitrate hexahydrate [14013-86-6], Fe(N03)2 6H20, is a green crystalline material prepared by dissolving iron in cold nitric acid that has a specific gravity of less than 1.034 g/cm. Use of denser, more concentrated acid leads to oxidation to iron(III). An alternative method of preparation is the reaction of iron(II) sulfate and barium or lead nitrate. The compound is very soluble in water. Crystallisation at temperatures below — 12°C affords an nonahydrate. Iron(II) nitrate is a useful reagent for the synthesis of other iron-containing compounds and is used as a catalyst for reduction reactions. 

Iron Sulfur Compounds. Many molecular compounds (18—20) are known in which iron is tetrahedraHy coordinated by a combination of thiolate and sulfide donors. Of the 10 or more stmcturaHy characterized classes of Fe—S compounds, the four shown in Figure 1 are known to occur in proteins. The mononuclear iron site REPLACE occurs in the one-iron bacterial electron-transfer protein mbredoxin. The [2Fe—2S] (10) and [4Fe—4S] (12) cubane stmctures are found in the 2-, 4-, and 8-iron ferredoxins, which are also electron-transfer proteins. The [3Fe—4S] voided cubane stmcture (11) has been found in some ferredoxins and in the inactive form of aconitase, the enzyme which catalyzes the stereospecific hydration—rehydration of citrate to isocitrate in the Krebs cycle. In addition, enzymes are known that contain either other types of iron sulfur clusters or iron sulfur clusters that include other metals. Examples include nitrogenase, which reduces N2 to NH at a MoFe Sg homocitrate cluster carbon monoxide dehydrogenase, which assembles acetyl-coenzyme A (acetyl-CoA) at a FeNiS site and hydrogenases, which catalyze the reversible reduction of protons to hydrogen gas. 

Thus, this first example of stereoselective radical reaction, initiated with the system based on Fe(CO)5, shows opportunities and prospects of using the metal complex initiators for obtaining the stereomerically pure adducts of bromine-containing compounds to vinyl monomers with chiral substituents. 

Fig. 6 Plot of Fe 2p3/2 BE vs. oxidation state for iron-containing compounds. The BE also varies between compounds having the same Fe oxidation state because of changes in the environment and screening of the nuclear charge provided by the ligands...

Abstract In this chapter, selected results obtained so far on Fe(III) spin crossover compounds are summarized and discussed. Fe(III) spin transition materials of ligands containing chalcogen donor atoms are considered with emphasis on those of M,f T-disubsti-tuted-dithiocarbamates, Ar,N-disubstituted-XY-carbamates (XY=SO, SSe, SeSe), X-xan-thates (X=0, S), monothio-/J-diketonates and X-semicarbazones (X=S, Se). In addition, attention is directed to Fe(III) spin crossover systems of multidentate Schiff base-type ligands. Examples of spin inter-conversion in Fe(III) compounds induced by light irradiation are given. 

Choppin GR (2003) Actinide speciation in the environment. Radiochim Acta 91 645-649 Claus P (1998) Selective hydrogenation of a,P-unsaturated aldehydes and other C = O and C = C bonds containing compounds. Top Catal 5 51-62 Colon D, Weber EJ, Anderson JL, Winget P, Suarez LA (2006) Reduction of nitrobenzenes and N-hydroxylanilines by Fe(II) species Elucidation of the reaction mechanism. Environ Sci Technol 40 4449-4454... 

In plasma, ca 90 vvl or copper is in the ineialloprotein ceruloplasmin. also known as ay-globulin, mol wi 151.000. which contains 8 atoms of copper per molecule. Ceruloplasmin has been identified as a ferroxi dasctll which catalyses Ihc oxidation of aromatic amines and of Pc to Fe . The ferric ion is then incorporated inlo iranslcrrin which is necessary lor the transport ol iron to tissues involved in Ihe synthesis or iron-containing compounds, e.g.. hemoglobin. Lowered levels of ceruloplasmin interfere with hemoglobin synthesis. 

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