Negatively-charged molecule made of carbon and oxygen
2D diagram of mellitate C12O6−12, one of the oxocarbon anions. Black circles are carbon atoms, red circles are oxygen atoms. Each blue halo represents one half of a negative charge.
In chemistry, an oxocarbon anion is a negative ion consisting solely of carbon and oxygen atoms, and therefore having the general formula C xOn− y for some integers x, y, and n.
The most common oxocarbon anions are carbonate, CO2−3, and oxalate, C2O2−4. There are however a large number of stable anions in this class, including several ones that have research or industrial use. There are also many unstable anions, like CO−2 and CO4−, that have a fleeting existence during some chemical reactions; and many hypothetical species, like CO4−4, that have been the subject of theoretical studies but have yet to be observed.
Stable oxocarbon anions form salts with a large variety of cations. Unstable anions may persist in very rarefied gaseous state, such as in interstellar clouds. Most oxocarbon anions have corresponding moieties in organic chemistry, whose compounds are usually esters. Thus, for example, the oxalate moiety [−O−(C=O)2−O−] occurs in the ester dimethyl oxalate H3C−O−(C=O)2−O−CH3.
In chemistry, an oxocarbonanion is a negative ion consisting solely of carbon and oxygen atoms, and therefore having the general formula C xOn− y for...
chemistry, an oxocarbon or oxide of carbon is a chemical compound consisting only of carbon and oxygen. The simplest and most common oxocarbons are carbon...
alcohol. In theory it could lose four protons to give the hypothetical oxocarbonanion orthocarbonate CO4−4, and is therefore considered an oxoacid of carbon...
carbon and oxygen, making it an oxocarbonanion. Partial ionization yields the monovalent hydrogen acetylenedicarboxylate anion HC4O−4. The acid was first...
electrosynthesis of H2O2 in aqueous media. The carbonate ion is the simplest oxocarbonanion. It consists of one carbon atom surrounded by three oxygen atoms, in...
hydrogensquarate anion HC4O−4; and the conjugate base of the hydrogensquarate anion is the divalent squarate anion C4O2−4. This is one of the oxocarbonanions, which...
(H3C−)3C−C2O5−C(−CH3)3. It is one of the oxocarbonanions, consisting solely of oxygen and carbon. The anion has the formula −O−C(=O)−O−C(=O)−O− or C2O2−5...
such as diethyl mesoxalate, (C2H5)2C3O5. Mesoxalate is one of the oxocarbonanions, which (like carbonate CO2−3 and oxalate C2O2−4) consist solely of...
neopentane. It is an oxocarbonanion, that is, consists only of carbon and oxygen. The term is also used for any salt with that anion; or for any ester with...
percarbonate is a divalent anion with formula CO2− 4. It is an oxocarbonanion that consists solely of carbon and oxygen. It would be the anion of a hypothetical...
oxalic anhydride (C2O4), and carbon trioxide (CO3). There are several oxocarbonanions, negative ions that consist solely of oxygen and carbon. The most common...
molecule would yield the dioxosuccinate anion, C 4O2− 6 or −O−(C=O)4−O−. This is one of the oxocarbonanions, which consist solely of carbon and oxygen...
below. Carbocation Chemical glycosylation Glycosyl donor Glycosidase Oxocarbonanion IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book")...
(sometimes peroxodicarbonate) is a divalent anion with the chemical formula C 2O2− 6. It is one of the oxocarbonanions, which consist solely of carbon and oxygen...
protons, the acid is expected to yield the anion C 8O4− 9, furantetracarboxylate, which is one of the oxocarbonanions (consisting solely of oxygen and carbon...
molecule would yield the trioxoglutarate anion, C 5O2− 7 or −O−(C=O)5−O−. This would be one of the oxocarbonanions, which consist solely of carbon and oxygen...
of four protons, the acid yields the anion C 6O4− 8, ethylenetetracarboxylate, which is one of the oxocarbonanions (consisting solely of oxygen and carbon)...
the acid is expected to yield the anion C 10O4− 10, benzoquinonetetracarboxylate, which is one of the oxocarbonanions (consisting solely of oxygen and...
compound with the formula C2O2 or O=C=C=O. It is an oxide of carbon (an oxocarbon), and can be described as the carbon-carbon covalent dimer of carbon monoxide...
C6O6, the sixfold ketone of cyclohexane. It is an oxide of carbon (an oxocarbon), a hexamer of carbon monoxide. The compound is expected to be highly...
nickel tetracarbonyl), mellitic anhydride (C12O9), and other exotic oxocarbons are also considered inorganic by some authorities.[citation needed] Nickel...
the fivefold ketone of cyclopentane. It would be an oxide of carbon (an oxocarbon), indeed a pentamer of carbon monoxide. As of 2000, the compound had yet...
is isoelectronic with both cyanide anion CN− and molecular nitrogen N2. Carbon monoxide is the simplest oxocarbon and is isoelectronic with other triply-bonded...
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