^ Bi-Jie Li Xi-Sha Zhang Zhang-Jie Shi (2014).^ a b Egon Wildermuth, Hans Stark, Gabriele Friedrich, Franz Ludwig Ebenhöch, Brigitte Kühborth, Jack Silver, Rafael Rituper "Iron Compounds" in Ullmann's Encyclopedia of Industrial Chemistry.Fe 4Cl 8(THF) 6: synthesis and a single crystal X-ray structure determination". "New polynuclear compounds of iron(II) chloride with oxygen donor ligands Part I. ![]() National Institute for Occupational Safety and Health (NIOSH). ^ NIOSH Pocket Guide to Chemical Hazards.Related, but more complex (in particular, basic or hydrated) minerals are hibbingite, droninoite and kuliginite. The natural form of the dihydrate is rokühnite - a very rare mineral. Lawrencite, (Fe,Ni)Cl 2, is the natural counterpart, and a typically (though rarely occurring) meteoritic mineral. FeCl 2 finds some use as a reagent in organic synthesis. It is the precursor to hydrated iron(III) oxides that are magnetic pigments. It is used as a precursor to make various grades of hematite that can be used in a variety of pigments. ![]() It is used for odor control in wastewater treatment. Aside from use in the laboratory synthesis of iron complexes, ferrous chloride serves as a coagulation and flocculation agent in wastewater treatment, especially for wastes containing chromate or sulfides. Unlike the related ferrous sulfate and ferric chloride, ferrous chloride has few commercial applications. FeCl 2 is used to generate NHC complexes in situ for cross coupling reactions. The anhydrous FeCl 2, which is soluble in THF, is a standard precursor in organometallic synthesis. For example, solutions of the hydrates react with two molar equivalents of Cl to give the salt 2. įeCl 2 and its hydrates form complexes with many ligands. Reactions Tetra(pyridine)iron dichloride is prepared by treating ferrous chloride with pyridine. The octahedron is completed by a pair of mutually trans aquo ligands. Each Fe center is coordinated to four doubly bridging chloride ligands. The dihydrate, FeCl 2(H 2O) 2, crystallizes from concentrated hydrochloric acid. Ferric chloride decomposes to ferrous chloride at high temperatures. The net reaction is shown:įeBr 2 and FeI 2 can be prepared analogously.Īn alternative synthesis of anhydrous ferrous chloride is the reduction of FeCl 3 with chlorobenzene: 2 FeCl 3 + C 6H 5Cl → 2 FeCl 2 + C 6H 4Cl 2 + HClįor the preparation of ferrocene ferrous chloride is generated in situ by comproportionation of FeCl 3 with iron powder in tetrahydrofuran (THF). This reaction gives the methanol solvate of the dichloride, which upon heating in a vacuum at about 160 ☌ converts to anhydrous FeCl 2. Anhydrous FeCl 2 įerrous chloride is prepared by addition of iron powder to a solution of hydrochloric acid in methanol. Ferrous chloride is also a byproduct from the production of titanium, since some titanium ores contain iron. The production of ferric chloride involves the use of ferrous chloride. Such solutions are designated "spent acid," or "pickle liquor" especially when the hydrochloric acid is not completely consumed: Hydrated forms of ferrous chloride are generated by treatment of wastes from steel production with hydrochloric acid. Production Structure of "FeCl 2(thf) x", Fe 4Cl 8(thf) 6, illustrating both tetrahedral and octahedral coordination geometries. The compound is highly soluble in water, giving pale green solutions. FeCl 2 crystallizes from water as the greenish tetrahydrate, which is the form that is most commonly encountered in commerce and the laboratory. The compound is white, but typical samples are often off-white. It is a paramagnetic solid with a high melting point. ![]() Iron(II) chloride, also known as ferrous chloride, is the chemical compound of formula FeCl 2.
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