Iron halide

Iron halides are the most common of these salts [more specifically as a chloride iron(II) chloride (ferrous chloride or FeCl2) and iron(III) chloride (ferric chloride or FeCls)]. 

Bis(imino)pyridine Iron Halide/MAO and Cobalt Halide/MAO Catalysts. 120... 

Extraordinary effectiveness has also been claimed for iron halides in polyphenylene oxide/polystyrene blends (40/60 to 60/40 (31), but much of the work on low concentration additives to date has been devoted to polycarbonates. 

The reactivity of iron(II) cations [FeX]+, where X = H, Me, C3H5, NH2, OH, F, Cl, Br, and I, have been examined by reactions with acetone (177). The C-C bond activation was the major process for the iron halide cations. The [FeF]+ ion promoted C-H bond activation as well as C-C bond activation and C-H bond activation was also promoted by the other [FeX]+ ions. The relative reactivities of the [FeX]+ ions toward acetone have been correlated with the thermochemical and electronic properties of the substituents X. 

Iron(II) formate dihydrate, 14 537 Iron(II) fumarate, 14 537 Iron gelbs, 19 399, 400 Irondl) gluconate dihydrate, 14 541 Iron group carbides, 4 690-692 Iron halides, 14 537-540 Iron hydroxide, water exchange rates and activation parameters of hexaaqua complexes, 7 589t Iron(II) hydroxide, 14 542 Iron(III) hydroxide, 14 542 Iron hydroxides, 14 541—542 Iron(II) iodide, 14 540 Iron(III) iodide, 14 540 Iron/iron alloy plating, 9 813—814. See also Fe entries... 

In the case of either substance the bromine is doubtless first added on at the double bond. Whilst the reaction takes place easily with the reactive double bond of the olefines, carriers such as iron, iron halide, and aluminium bromide are required for the sluggish double bond of the benzene ring ... 

Violent reactions can occur with many metal hahdes. For example, with zinc halides or iron halides, single replacement reactions take place. Such potassium-metal halide mixtures can react violently when subjected to mechanical shock. 

Halides. All of the anhydrous and hydrated binary halides of iron(II) and iron(III) are known with the exception of the hydrated iodide of iron(III). A large number of complex iron halides have been prepared and characterized (6). 

Iron halides react with halide salts to afford anionic halide complexes. Because iron(III) is a hard acid, the complexes that it forms are most stable with F and decrease in both coordination number and stability with heavier halides. No stable I complexes are known. [FeF5(H20)]2 is the predominant iron fluoride species in aqueous solution. The [FeF6]3 ion can be prepared in fused salts. Whereas six-coordinate [FeClJ3 is known, four-coordinate complexes are favored for chloride. Salts of tetrahedral [FeClJ can be isolated if large cations such as tetraphenylarsonium or tetraalkylammonium are used. [FeBrJ is known but is thermally unstable and disproportionates to iron(II) and bromine. Complex anions of iron(II) halides are less common. [FeClJ2 has been obtained from FeCl2 by reaction with alkali metal chlorides in the melt or with tetraethylammonium chloride in deoxygenated ethanol. 

X-ray Photoelectron Spectroscopy (XPS) tests were conducted on surfaces lubricated with a sulfur-containing extreme pressure additive, dibenzyl sulfide (Baldwin, 1976 Bird and Galvin, 1976). The films can arise from the use of additives that contain sulfur, phosphorus, chlorine, bromine, or boron and the differences in reactivity are affected by the formation of protective layers. Triboinduced electrons are said to activate the formation of iron halides, iron phosphates and iron sulfides (Dorison and Ludema, 1985 Grunberg, 1966 Kajdas, 2001 McFadden et al., 1998 ). When a chemical reaction takes place, e.g., oxygen interacts with aluminum to form aluminum oxide, a large oxygen peak is seen at approximately 500 eV in the Auger electron spectra (Benndorf et al., 1977 Nakayama et al., 1995). 

Finally, Table 4 lists the halides—chlorine, bromium, and iodine—in the core. McDonough and Sun (1995) noted the marked depletion of these elements in the silicate Earth and suggested that this effect is due possibly to their incorporation into the Earth s core, or that the region of the nebula at 1 AU was anomalously depleted in the halides. There are iron halides, some of which are found in chondrites. However, such halides in chondrites are believed to be decompositional products created during terrestrial weathering (Rubin, 1997). 

Benzene can react (by substitution) with CI2 or Br2. These reactions require either iron or an iron halide as a catalyst. For example ... 

It has been shown 162) that volatile metal halides with relatively weak Me-X bonds are extremely effective flame retardants. Di- or trivalent iron halides in very low... 

Encouraged by the interesting results obtained in the high-pressure synthesis of acetic acid from methanol and carbon monoxide using nickel, cobalt, and iron halides as catalysts (5-7), the synthesis of glycolic acid from formaldehyde, carbon monoxide and water has been studied using various nickel, cobalt, and iron catalysts. 

Transmetallation of iron halides with lithium acetylides or alkynyl Grignards affords a-alkynyl complexes in moderate... 

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