Organic Mercury Compound

Organic Mercury Compound


any of the compounds containing a carbon-mercury (C—Hg) bond. The two major types of known organic mercury compounds are R—Hg—R’ and R—HgX, where R and R’ are organic radicals and X is an acid group. The two types are interconvertible:

Symmetrizing agents include NH3, KI, amalgams, and Na2S203. The lower homologs of organic mercury compounds of the R2Hg type are volatile, heavy liquids, while the higher homologs and RHgX are crystalline substances insoluble in water and soluble in organic solvents.

There are four chief methods for obtaining organic mercury compounds. The first involves the reaction of mercury salts with organic compounds of magnesium and lithium:

The second is the substitution of mercury for hydrogen in organic compounds (mercuration):

The third is the addition of mercury salts to unsaturated compounds:

The fourth method involves the decomposition of diazonium salts in the presence of mercury salts (Nesmeianov reaction).

The C—Hg bond in organic mercury compounds is broken by halogens, acids, salts of certain metals, and such oxidizing agents as oxygen and ozone. Upon irradiation, organic mercury compounds decompose with the release of metallic mercury and free radicals; the radicals then undergo further transformations.

Organic mercury compounds are used in organic synthesis and find limited use as fungicides. They are intermediates in certain processes of industrial importance catalyzed by mercury salts, for example, in the synthesis of acetaldehyde by the hydration of acetylene (Kucherov reaction).


References in periodicals archive ?
Thimerosal is an organic mercury compound used widely in the 1990s as a preservative in vaccines, especially in multidose packages.
The most common organic mercury compound in the environment is methylmercury.
Both inorganic and organic mercury compounds are absorbed through the gastrointestinal tract, which then affect other systems.
Organic mercury compounds have been used as fungicides and pharmaceutical agents like mercurochrome in topical antiseptics, thiomersal as a preservative in vaccines.
Organic mercury compounds were first described in the 1800s, with fatal cases of methylmercury poisoning reported in 1865.
Organic mercury compounds, such as methyl-mercury, are formed when mercury combines with carbon.
mercurous chloride, mercuric chloride, mercuric acetate, and mercuric sulfide); and 3) alkyl, dialkyl, and aryl organic mercury compounds (e.
Allen seems to think that all forms of mercury are interchangeable, including elemental mercury; inorganic mercury compounds such as calomel, which is mercury (I) chloride, and mercury (II) chloride; and organic mercury compounds.
Organic mercury compounds are made up of inorganic or metallic mercury that has been changed by microorganisms and enzyme reactions in human blood.
In organic mercury compounds, mercury forms a covalent bond with carbon.
Metallic mercury and its inorganic salts have been known since antiquity, but organic mercury compounds with a covalent bond between the mercuric ion and the organic radical were first described in the 19th century.
In water, through the action of aquatic microorganisms, inorganic mercury can be combined with carbon to form organic mercury compounds.