organometallic chemistry

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organometallic chemistry,

the reactions and use of a class of compounds (R-M) that contain a covalent bond between carbon and metal. They are prepared either by direct reaction of the metal with an organic compound or by replacement of a metal from another organometallic substance. Their use is based on the polar R-M bond, in which the carbon atom carries a partial negative charge, and on the nature of the metal atom. In synthesis they act as nucleophiles that can bond with relatively positive carbon atoms in compounds such as alkyl halides, aldehydes, and ketones. For example, the Grignard reagent, RMgX (where X equals Br, Cl, or I), and organolithium compounds react with ketones to give secondary alcohols. In industry, butyllithium is used for the polymerization of isoprene in the manufacture of synthetic rubber; metalloorganic compounds serve as catalysts. The semimetals, boron, and silicon are important organometallics; organoboranes are used in synthesis, while organosilicones are polymerized to manufacture plastics and elastomers. Many organometallics are toxic primarily because of the toxicity of the metal. For example tetraethyl leadtetraethyl lead
, (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy.
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 has been banned as gasoline additive and the conversion of mercury to mercury alkyls by fish has had serious consequences in Japan.
References in periodicals archive ?
x]As-GaAs Laser Diodes Grown by Metalorganic Chemical Capor Deposition," Applied Physics Letters 32 (March 1978): 295-97.
PV, "Preparation of Dilute Magnetic Semiconductor Films by Metalorganic Chemical Vapor Deposition.
Limited Tenders are invited for High Purity Metalorganic Compounds With Ultra Low Oxygen
In particular, the partnership aims to explore how to produce more cost-efficient metalorganic precursor grades that will offer the kind of long-term benefits the industry is looking for.
Martinez Nunez, Metalorganic Catalysts for Synthesis and Polymerizations, Germany (1999).
Metalorganic precursors for the ytrium-barium-copper-oxide group of superconductors were spin-coated onto single-crystal yttrium, stabilized zirconia, and magnesium oxide substrates, dried in air, then thermally processed in oxygen using the solar furnace at SERI.
For more than 35 years, Dow has been an important player in the SSL market as a leading supplier of metalorganic CVD precursors, so we understand the technology needs.
Li, Separation of Hydrocarbons with a Microporous MetalOrganic Framework, Angew.
When he checked back a week later, there was a modest amount of a microporous metalorganic framework--the types of modern materials that are now finding applications in gas storage and chemical sensors and are even thought suitable as light-harvesting materials in solar panel construction.
TAOYUAN, Taiwan -- Dow Electronic Materials, a business unit of Dow Advanced Materials, today announced that Epistar Corporation, a world leading high brightness LED epiwafer and chip manufacturer, has awarded its first-ever Supplier Award to the Metalorganic Technologies business of Dow Electronic Materials.