In chemistry, an onium ion is a cation formally obtained by the protonation of mononuclear parent hydride of a pnictogen (group 15 of the periodic table)...
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The nitronium ion, [NO2]+, is a cation. It is an onium ion because its nitrogen atom has +1 charge, similar to ammonium ion [NH4]+. It is created by the...
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Acylium ion, a type of oxonium ion with the structure R–C≡O+ Onium ion, a +1 cation derived by protonation of a hydride (includes oxonium ions) Pyrylium...
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A halonium ion is any onium ion containing a halogen atom carrying a positive charge. This cation has the general structure R−+X−R′ where X is any halogen...
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given, as the number of polyatomic ions encountered in practice is very large. Monatomic ion Protonation Onium ion Petrucci, Ralph H.; Herring, F. Geoffrey;...
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An onium (plural: onia) is a bound state of a particle and its antiparticle. These states are usually named by adding the suffix -onium to the name of...
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kryptonium ion, KrH+, is an onium ion, consisting of protonated krypton. Kryptonium is known in dilute gas phase. Although salts of the fluorokryptonium ion, KrF+...
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molecules More carbonium ions called non-classical ions are found in certain norbornyl systems Onium compounds Carbenium ion George Andrew Olah (1972)...
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C8H8N+, and forms chemical compounds in combination with anions. It is an onium ion derived from its parent compound, indole, by the addition of a proton...
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of protolytic solvents. Lyate ion, a deprotonated solvent molecule Onium ion, a protonated molecule more generally Ion transport number Ionic atmosphere...
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Hydronium (redirect from Hydronium ion)
Geological Survey. Retrieved 9 November 2021. "Table 17 Mononuclear parent onium ions". IUPAC. Tang, Jian; Oka, Takeshi (1999). "Infrared spectroscopy of H3O+:...
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Methanium (redirect from Methonium ion)
+1 electric charge. It is a superacid and one of the onium ions, indeed the simplest carbonium ion. It is highly unstable and highly reactive even upon...
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atom, such as a quaternary ammonium or phosphonium cation (generally: onium ions), and with a negatively charged functional group, such as a carboxylate...
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higher oxidation states. Ate complexes are a counterpart to onium ions. Lewis acids form ate ions when the central atom reacts with a donor (2 e− X-type ligand)...
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compound Onium ion Quaternary phase IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "Onium compounds"...
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Photopolymer (section Onium salts)
counter ion. It is thought that the acidic proton generated is what ultimately initiates the polymerization. Since their discovery in the 1970s aryl onium salts...
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the appropriate length and with two methonium, heads have small trimethyl onium heads and flexible links. They all exhibit a depolarizing block. Aminosteroids...
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perchlorate. The proposed reaction pathway includes onium ion formation with the following perchlorate ion addition. The “doping effect” can also be observed...
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system. The monomers can be activated by Bronsted acids, carbenium ions, onium ions, and metal cations. CROP can be a living polymerization and can be...
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Carbocation (section Non-classical ions)
electrophilic attack of H+ or R+ on an alkane, in analogy to other main group onium species, while a carbocation that contains any type of three-centered bonding...
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purple Ph5Bi was the first to be synthesized so. Bi(V) easily forms an onium ion for example by protonation with p-toluenesulfonic acid: Ph5Bi + HO3SAr...
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The xenonium ion, XeH+, is an onium compound, consisting of protonated xenon. Although the existence of the xenonium salts has not been proven, the isolated...
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known as mustards.[citation needed] Such compounds can form cyclic "onium" ions (sulfonium, ammonium, etc.) that are good alkylating agents. Other such...
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Ammonium (redirect from Ammonium ion)
not exist as a pure metal but does as an amalgam (alloy with mercury). Onium compounds Fluoronium, ([H2F]+ and substituted derivatives) Oxonium ([R3O]+...
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George A.; Donovan, Daniel J.; Shen, Jacob; Klopman, Gilles (1975). "Onium ions. XVI. Hydrogen-deuterium exchange accompanying the cleavage of ammonium...
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Reactions with soft electrophiles (e.g. Br+) deliver positively charged onium ions 13. Transition-metal-catalysed reactions proceed via allylic intermediates...
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Sulfonium (redirect from Sulfonium ion)
In organic chemistry, a sulfonium ion, also known as sulphonium ion or sulfanium ion, is a positively-charged ion (a "cation") featuring three organic...
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Trimethylsulfonium (category Sulfur ions)
characteristics of molten salts derived from trimethylsulfonium bromide". Canadian Journal of Chemistry. 73 (4): 593–598. doi:10.1139/v95-076. Onium compounds...
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THE PHYSIOLOGICAL ACTIVITY OF CERTAIN -ONIUM COMPOUNDS. THE MOBILITIES OF THE -ONIUM IONS. I. SULFONIUM IONS." J. Am. Chem. Soc., 1925, 47 (7), pp 1904–1916...
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afford methyl halides: ROCH3 + HBr → CH3Br + ROH These reactions proceed via onium intermediates, i.e. [RO(H)CH3]+Br−. Some ethers undergo rapid cleavage with...
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