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Ferrates
Ferrate loosely refers to a material that can be viewed as containing anionic iron complexes. Examples include tetrachloroferrate ( eCl4sup>2−), oxyanions ( ), tetracarbonylferrate ( e(CO)4sup>2−), the organoferrates. The term ferrate derives . Some ferrates are called super-iron by some and have uses in battery applications and as an oxidizer. It can be used to clean water safely from a wide range of pollutants, including viruses, microbes, arsenic, sulfur-containing compounds, cyanides and other nitrogen-containing contaminants, many organic compounds, and algae. File:Disodium tetracarbonylferrate.png, Disodium salt of tetracarbonylferrate File:Ferrate ion.svg, Structure of ferrate(VI) Ferrate(VI) is the inorganic anion with the chemical formula eO4sup>2−. It is photosensitive, contributes a pale violet colour to compounds and solutions containing it and is one of the strongest water-stable oxidizing species known. Although ..., eO4sup>2− File:1-Butyl-3-methylimidaz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferrate(VI)
Ferrate(VI) is the inorganic anion with the chemical formula eO4sup>2−. It is photosensitive, contributes a pale violet colour to compounds and solutions containing it and is one of the strongest water-stable oxidizing species known. Although it is classified as a weak base, concentrated solutions containing ferrate(VI) are corrosive and attack the skin and are only stable at high pH. It is similar to the somewhat more stable permanganate. Nomenclature The term ''ferrate'' is normally used to mean ferrate(VI), although it can refer to other iron-containing anions, many of which are more commonly encountered than salts of eO4sup>2−. These include the highly reduced species disodium tetracarbonylferrate , and salts of the iron(III) complex tetrachloroferrate eCl4sup>− in 1-Butyl-3-methylimidazolium tetrachloroferrate. Although rarely studied, ferrate(V) eO4sup>3− and ferrate(IV) eO4sup>4− oxyanions of iron also exist. These too are called ferrates. Sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disodium Tetracarbonylferrate
Disodium tetracarbonylferrate is the organoiron compound with the formula Na2 e(CO)4 It is always used as a solvate, e.g., with tetrahydrofuran or dimethoxyethane, which bind to the sodium cation. An oxygen-sensitive colourless solid, it is a reagent in organometallic and organic chemical research. The dioxane solvated sodium salt is known as Collman's reagent, in recognition of James P. Collman, an early popularizer of its use. Structure The dianion e(CO)4sup>2− is isoelectronic with Ni(CO)4. The iron center is tetrahedral, with Na+---OCFe interactions. It is commonly used with dioxane complexed to the sodium cation. Synthesis The reagent was originally generated in situ by reducing iron pentacarbonyl with sodium amalgam. Modern synthesis use sodium naphthalene or sodium benzophenone ketyls as the reducants: :Fe(CO)5 + 2 Na → Na2 e(CO)4 + CO When a deficiency of sodium is used, the reduction affords deep yellow octacarbonyl ''di''ferrate: :2 Fe(CO)5 + 2 Na → Na ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potassium Tris(oxalato)ferrate
Potassium ferrioxalate, also called potassium trisoxalatoferrate or potassium tris(oxalato)ferrate(III) is a chemical compound with the formula . It often occurs as the trihydrate . Both are crystalline compounds, lime green in colour. The compound is a salt consisting of ferrioxalate anions, , and potassium cations . The anion is a transition metal oxalate complex consisting of an iron atom in the +3 oxidation state and three bidentate oxalate ligands. Potassium is a counterion, balancing the −3 charge of the complex. In solution, the salt dissociates to give the ferrioxalate anion, , which appears fluorescent green in color. The salt is available in anhydrous formA. Saritha, B. Raju, M. Ramachary, P. Raghavaiah, and K. A. Hussain (2012) "Synthesis, Crystal Structure and Characterization of Chiral, Three-Dimensional Anhydrous Potassium Tris(oxalato)ferrate(III)", ''Physica B: Condensed Matter'', volume 407, issue 21, pages 4208-4213. as well as a trihydrate. The ferrio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron
Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's outer and inner core. It is the fourth most abundant element in the Earth's crust, being mainly deposited by meteorites in its metallic state. Extracting usable metal from iron ores requires kilns or furnaces capable of reaching , about 500 °C (900 °F) higher than that required to smelt copper. Humans started to master that process in Eurasia during the 2nd millennium BC and the use of iron tools and weapons began to displace copper alloys – in some regions, only around 1200 BC. That event is considered the transition from the Bronze Age to the Iron Age. In the modern world, iron alloys, such as steel, stainless steel, cast iron and special steels, are by far the most common industrial metals, due to their mechan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 complex, coordination and Organometallic chemistry, organometallic chemistry: indeed, it was the discovery of an iron compound, ferrocene, that revolutionalized the latter field in the 1950s.Greenwood and Earnshaw, p. 905 Iron is sometimes considered as a prototype for the entire block of transition metals, due to its abundance and the immense role it has played in the technological progress of humanity. Its 26 electrons are arranged in the electron configuration, configuration [Ar]3d64s2, of which the 3d and 4s electrons are relatively close in energy, and thus it can lose a variable number of electrons and there is no clear point where further ionization becomes unprofitable. Iron forms compounds mainly in the oxidation states +2 (iron(II), "ferrous") and +3 (iron(III), "ferric"). Iron also occurs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anions
An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convention. The net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons. A cation is a positively charged ion with fewer electrons than protons (e.g. K+ ( potassium ion)) while an anion is a negatively charged ion with more electrons than protons (e.g. Cl− ( chloride ion) and OH− (hydroxide ion)). Opposite electric charges are pulled towards one another by electrostatic force, so cations and anions attract each other and readily form ionic compounds. Ions consisting of only a single atom are termed ''monatomic ions'', ''atomic ions'' or ''simple ions'', while ions consisting of two or more atoms are termed polyatomic ions or ''molecular ions''. If only a + or − is present, it indica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
