Dication
A dication is any cation, of general formula X2+, formed by the removal of two electrons from a neutral species. Diatomic dications corresponding to stable neutral species (e.g. H2+2 formed by removal
Thiopyrylium
Thiopyrylium is a cation with the chemical formula C5H5S+. It is analogous to the pyrylium cation with the oxygen atom replaced by a sulfur atom. Thiopyrylium salts are less reactive than the analogou
Fluoronium
The fluoronium ion is an inorganic cation with the chemical formula H2F+. It is one of the cations found in fluoroantimonic acid. The structure of the salt with the Sb2F−11 anion, has been determined.
Chlormequat
Chlormequat is an organic compound with the formula ClCH2CH2N(CH3)+3 that is used as a plant growth regulator. It is typically sold as the chloride salt, chlormequat chloride (C5H13Cl2N), a colorless
Halonium ion
A halonium ion is any onium ion containing a halogen atom carrying a positive charge. This cation has the general structure R−−R′ where X is any halogen and no restrictions on R, this structure can be
Dihydrogen cation
The dihydrogen cation or hydrogen molecular ion is a cation (positive ion) with formula H+2. It consists of two hydrogen nuclei (protons) sharing a single electron. It is the simplest molecular ion. T
Mercury polycations
Mercury polycations are polyatomic cations that contain only mercury atoms. The best known example is the Hg2+2 ion, found in mercury(I) (mercurous) compounds. The existence of the metal–metal bond in
Selenopyrylium
Selenopyrylium is an aromatic heterocyclic compound consisting of a six-membered ring with five carbon atoms and a positively charged selenium atom.
Chloryl
In chemistry, chloryl refers to a triatomic cation with chemical formula ClO+2. This species has the same general structure as chlorite (ClO−2) but it is electronically different, with chlorine having
1-Methylnicotinamide
1-Methylnicotinamide (trigonellamide) is a prototypic organic cation. 1-Methylnicotinamide is the methylated amide of Nicotinamide (niacinamide, vitamin B3). 1-Methylnicotinamide is an endogenic subst
Uranium(IV) compounds
Uranous is the chemical term for the reduced tetrapositive cation of uranium that exhibits the valence U4+. It is one of the two common ionic states of uranium found in nature, the other being the oxi
Kryptonium ion
The kryptonium ion, KrH+, is a hypothetical onium ion, consisting of protonated krypton. Although salts of the fluorokryptonium ion, KrF+, are known to exist, the existence of the kryptonium cation it
Arsonium
The arsonium cation is a positively charged polyatomic ion with the chemical formula AsH+4. An arsonium salt is a salt containing either the arsonium (AsH+4) cation, such as arsonium bromide (AsH+4Br−
Hydrazinium
Hydrazinium is the cation with the formula [N2H5]+. This cation has a methylamine-like structure ([H2N−NH3]+). It can be derived from hydrazine by protonation (treatment with a strong acid). Hydrazini
Protonated hydrogen cyanide
HCNH+, also known as protonated hydrogen cyanide, is a molecular ion of astrophysical interest. It also exists in the condensed state when formed by superacids.
Trifluoromethyl cation
The trifluoromethyl cation is a molecular cation with a formula of CF+3. It is a carbocation due to its positively charged carbon atom. It is part of the family of carbenium ions, with three fluorine
Sulfonium
In organic chemistry, a sulfonium ion, also known as sulphonium ion or sulfanium ion, is a positively-charged ion (a "cation") featuring three organic substituents attached to sulfur. These organosulf
Tetraxenonogold(II)
Tetraxenonogold(II), gold tetraxenide(II) or AuXe2+4 is a cationic complex with a square planar configuration of atoms. It is found in the compound AuXe2+4(Sb2F−11)2, which exists in triclinic and tet
Dioxidanylium
Dioxidanylium, which is protonated molecular oxygen, or just protonated oxygen, is an ion with formula HO+2.It is formed when hydrogen containing substances combust, and exists in the ionosphere, and
Phosphenium
Phosphenium ions, not to be confused with phosphonium or phosphirenium, are divalent cations of phosphorus of the form [PR2]+. Phosphenium ions have long been proposed as reaction intermediates.
Onium ion
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), chalcogen (group 16), or halogen (group 17).
Hydron (chemistry)
In chemistry, a hydron is the general name for a cationic form of atomic hydrogen, represented with the symbol H+. The term "hydron", endorsed by the IUPAC, includes cations of hydrogen regardless of
Tetrabutylammonium
Tetrabutylammonium is a quaternary ammonium cation with the formula [N(C4H9)4]+. It is used in the research laboratory to prepare lipophilic salts of inorganic anions. Relative to tetraethylammonium d
Ammonium
The ammonium cation is a positively-charged polyatomic ion with the chemical formula NH+4 or [NH4]+. It is formed by the protonation of ammonia (NH3). Ammonium is also a general name for positively ch
Hydrogen ion cluster
A hydrogen molecular ion cluster or hydrogen cluster ion is a positively charged cluster of hydrogen molecules. The hydrogen molecular ion (H+2) and trihydrogen ion (H+3) are well defined molecular sp
Diazenylium
Diazenylium is the chemical N2H+, an inorganic cation that was one of the first ions to be observed in interstellar clouds. Since then, it has been observed for in several different types of interstel
Hydrogen-bridged cations
Hydrogen-bridged cations are a type of charged species in which a hydrogen atom is simultaneously bonded to two atoms through partial sigma bonds. While best observable in the presence of superacids a
Lyonium ion
In chemistry, a lyonium ion is the cation derived by the protonation of a solvent molecule. For example, a hydronium ion is formed by the protonation of water, and CH3OH+2 is the cation formed by the
Trihydrogen cation
The trihydrogen cation or protonated molecular hydrogen is a cation (positive ion) with formula H+3, consisting of three hydrogen nuclei (protons) sharing two electrons. The trihydrogen cation is one
Silylium ion
A silylium ion is a reactive silyl-containing cation with the formula SiR+3. With three rather than the usual four bonds to Si, silylium ions are the silicon analogues of carbenium ions. They can be v
Ethylmercury
Ethylmercury (sometimes ethyl mercury) is a cation composed of an organic CH3CH2- species (an ethyl group) bound to a mercury(II) centre, making it a type of organometallic cation, and giving it a che
Pentazenium
In chemistry, the pentazenium cation (also known as pentanitrogen) is a positively-charged polyatomic ion with the chemical formula N+5 and structure N−N−N−N−N. Together with solid nitrogen polymers a
Decynium-22
Decynium-22 is a cationic derivative of quinoline, and a potent inhibitor of the plasma membrane monoamine transporter (PMAT), as well as all members of the organic cation transporter (OCT) family in
Proton
A proton is a stable subatomic particle, symbol p, H+, or 1H+ with a positive electric charge of +1 e elementary charge. Its mass is slightly less than that of a neutron and 1,836 times the mass of an
Tetraethylammonium
Tetraethylammonium (TEA), (NEt+4) or (Et4N+) is a quaternary ammonium cation consisting of four ethyl groups attached to a central nitrogen atom, and is positively charged. It is a counterion used in
Isothiouronium
In organic chemistry, isothiouronium is a functional group with the formula [RSC(NH2)2]+ (R = alkyl, aryl) and is the acid salt of isothiourea. The H centres can also be replaced by alkyl and aryl. St
Tetramethylammonium
Tetramethylammonium (TMA) or (Me4N+) is the simplest quaternary ammonium cation, consisting of four methyl groups attached to a central nitrogen atom, and is isoelectronic with neopentane. It is posit
Phosphirenium ion
Phosphirenium ions (R1R2C2PY1Y+2) are a series of organophosphorus compounds containing unsaturated three-membered ring phosphorus (V) heterocycles and is believed to be present in such molecules. Man
Telluropyrylium
Telluropyrylium is an aromatic heterocyclic compound consisting of a six member ring with five carbon atoms, and a positively charged tellurium atom. Derivatives of telluropyrylium are important in re
Helium hydride ion
The helium hydride ion or hydridohelium(1+) ion or helonium is a cation (positively charged ion) with chemical formula HeH+. It consists of a helium atom bonded to a hydrogen atom, with one electron r
Cyclopropenium ion
The cyclopropenium ion is the cation with the formula C3H+3. It has attracted attention as the smallest example of an aromatic cation. Its salts have been isolated, and many derivatives have been char
Tetrafluoroammonium
The tetrafluoroammonium cation (also known as perfluoroammonium) is a positively charged polyatomic ion with chemical formula NF+4. It is equivalent to the ammonium ion where the hydrogen atoms surrou
Tropylium cation
In organic chemistry, the tropylium ion or cycloheptatrienyl cation is an aromatic species with a formula of [C7H7]+. Its name derives from the molecule tropine from which cycloheptatriene (tropyliden
S-Adenosylmethioninamine
S-Adenosylmethioninamine is a substrate that is required for the biosynthesis of polyamines including spermidine, spermine, and thermospermine. It is produced by decarboxylation of S-adenosyl methioni
Phosphonium
In chemistry, the phosphonium (more obscurely: phosphinium) cation describes polyatomic cations with the chemical formula PR+4 (where R is a hydrogen or an alkyl, aryl, or halide group). These cations
Thiamine
Thiamine, also known as thiamin and vitamin B1, is a vitamin, an essential micronutrient, that cannot be made in the body. It is found in food and commercially synthesized to be a dietary supplement o
Trimethylsulfonium
Trimethylsulfonium (systematically named trimethylsulfanium and trimethylsulfur(1+)) is an organic cation with the chemical formula (CH3)3S+ (also written as C3H9S+).
Carbenium ion
A carbenium ion is a positive ion with the structure RR′R″C+, that is, a chemical species with a trivalent carbon that bears a +1 formal charge. In older literature the name carbonium ion was used for
Pyramidal carbocation
A pyramidal carbocation is a type of carbocation with a specific configuration. This ion exists as a third class, besides the classical and non-classical ions. In these ions, a single carbon atom hove
Xenonium
The xenonium ion, XeH+, is an onium compound, consisting of protonated xenon. Although the existence of the xenonium cation itself has not been proven, salts of the fluoroxenonium ion, XeF+, are known
Oxycation
In chemistry, an oxycation is a polyatomic ion with a positive charge that contains oxygen.
Bismuth polycations
Bismuth polycations are polyatomic ions of the formula Bin+x. They were originally observed in solutions of bismuth metal in molten bismuth chloride. It has since been found that these clusters are pr
Methylpyridinium
Methylpyridinium is a chemical compound which is the quaternary ammonium compound derived from the N-methylation of pyridine. It is found in some coffee products. It is not present in unroasted coffee