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 ?
The new precursors should offer an attractive alternative to the current commercially available metalorganics, which are designed for applications other than high-efficiency silicon wafer solar cells.
Simpson, "The Use of Metalorganics in the Preparation of Semiconductor Materials," Journal of The Electrochemical Society 118 (1971): 1864-68.
Caption: The metalorganic chemical vapour deposition (MOCVD) reactors at the Canadian Photonics Fabrication Centre in Ottawa is a chemical vapour deposition method used to produce single or polycrystalline thin films.
In addition to the metalorganic CVD precursors, which are used to make the active light-emitting areas in LEDs, the new LED Technologies business will supply photoresists, related ancillaries for lithographic processing, and pads and slurries for CMP - all of which are used in the manufacture of LEDs.
Epistar Corporation presents its first annual Supplier Award to the Metalorganic Technologies business unit of Dow Electronic Materials.
The Company stated that Goss will oversee all aspects of SAFC Hitech's commercial efforts, including product development and growth in the Company's Atomic Layer Deposition, Metalorganic Chemical Vapour Deposition, Energy and Display and LED segments.
The second area is in developing self-assembly techniques to form nanoscale molecular assemblies or to prepare metalorganic or organometallic polymers, using coordination chemistry in conjunction with several other secondary bonding forces to direct the reactions in interesting ways.
Dow Electronic Materials, a business unit of The Dow Chemical Company (NYSE: DOW) today announced it has broken ground for a new metalorganic precursor manufacturing plant in Cheonan, Korea.
Goss will lead all aspects of SAFC Hitech's commercial efforts, including product development and growth in the Company's Atomic Layer Deposition (ALD), Metalorganic Chemical Vapour Deposition (MOVCD), Energy and Display and LED segments.
In addition, Dow Electronic Materials will build a new metalorganic precursor manufacturing plant in Korea, which is expected to begin operating in early 2011, to create capacity for long-term demand.
AIXTRON, a leading manufacturer of metalorganic chemical vapor deposition (MOCVD) equipment, is using the VaporStation central delivery system to deliver trimethylgallium (TMGa) to a CRIUS([R]) and a Planetary MOCVD system.
As the leading global supplier of metalorganic (MO) precursors, Rohm and Haas designed the VaporStation central delivery system in cooperation with Matheson Tri-Gas, Inc.