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  2. Iron compounds - Wikipedia

    en.wikipedia.org/wiki/Iron_compounds

    Iron shows the characteristic chemical properties of the transition metals, namely the ability to form variable oxidation states differing by steps of one and a very large coordination and organometallic chemistry: indeed, it was the discovery of an iron compound, ferrocene, that revolutionalized the latter field in the 1950s. [1]

  3. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron(II) chloride is used as a reducing flocculating agent, in the formation of iron complexes and magnetic iron oxides, and as a reducing agent in organic synthesis. [ 145 ] Sodium nitroprusside is a drug used as a vasodilator .

  4. Evolution of metal ions in biological systems - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_Metal_Ions_in...

    The Earth began as an iron aquatic world with low oxygen. The Great Oxygenation Event occurred approximately 2.4 Ga (billion years ago) as cyanobacteria and photosynthetic life induced the presence of dioxygen in the planet's atmosphere. Iron became insoluble (as did other metals) and scarce while other metals became soluble.

  5. Organoiron chemistry - Wikipedia

    en.wikipedia.org/wiki/Organoiron_chemistry

    [1] [2] Organoiron compounds are relevant in organic synthesis as reagents such as iron pentacarbonyl, diiron nonacarbonyl and disodium tetracarbonylferrate. Although iron is generally less active in many catalytic applications, it is less expensive and "greener" than other metals. [3]

  6. Aluminothermic reaction - Wikipedia

    en.wikipedia.org/wiki/Aluminothermic_reaction

    The sparks flying outwards are globules of molten iron trailing smoke in their wake. Video of aluminothermic reaction to make stainless steel from iron ore. Aluminothermic reactions are exothermic chemical reactions using aluminium as the reducing agent at high temperature. The process is industrially useful for production of alloys of iron. [1]

  7. Metal carbonyl - Wikipedia

    en.wikipedia.org/wiki/Metal_carbonyl

    The iron pentacarbonyl was used for the production of high-purity iron, so-called carbonyl iron, and iron oxide pigment. [40] Not until 1927 did A. Job and A. Cassal succeed in the preparation of chromium hexacarbonyl and tungsten hexacarbonyl, the first synthesis of other homoleptic metal carbonyls. [citation needed]

  8. Sandwich compound - Wikipedia

    en.wikipedia.org/wiki/Sandwich_compound

    Because the metal is usually situated between the two rings, it is said to be "sandwiched". A special class of sandwich complexes are the metallocenes . The term sandwich compound was introduced in organometallic nomenclature in 1956 in a report by J. D. Dunitz, L. E. Orgel and R. A. Rich, who confirmed the structure of ferrocene by X-ray ...

  9. Metallocene - Wikipedia

    en.wikipedia.org/wiki/Metallocene

    General chemical structure of a metallocene compound, where M is a metal cation. A metallocene is a compound typically consisting of two cyclopentadienyl anions (C 5 H − 5, abbreviated Cp) bound to a metal center (M) in the oxidation state II, with the resulting general formula (C 5 H 5) 2 M. Closely related to the metallocenes are the metallocene derivatives, e.g. titanocene dichloride or ...