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 ?
[30] Woelk E (2010) Performance of a central delivery system for metalorganic precursors.
All the Dy-O bond distances are comparable to those observed in the Dy-based metalorganic frameworks.
'Metalorganic vapor-phase epitaxial growth of vertically well-aligned zno nanorods', Applied Physics Letters, 80(22): 4232-4234.
Tokyo, Japan, March 26, 2014 --( Martini Tech has started to offer its customers a new GaN deposition service on sapphire substrates by MOCVD (metalorganic chemical vapour deposition) for LED (light emitting diode) applications.
This thin film can be produced with various methods such as metalorganic chemical vapor deposition (MOCVD) [13], sol-gel [14-17], atomic laser deposition (ALD) [18], hydrothermal synthesis [19], metal organic decomposition (MOD) [20, 21], and chemical solution deposition (CSD) [22-26].
In work reported in the journal Science, an international team of researchers led by a group at Lind University in Sweden learned to grow nanowires made of indium phosphide using a method catted metalorganic chemical vapor deposition, in which the nanowire crystals are built up through agglomeration of individual molecules.
Pustovit, "Electron transport properties of double deltadoped GaAs structures grown by low-pressure metalorganic chemical vapor deposition," Appl.
The new pump has been optimised for metalorganic chemical vapour deposition (MOCVD) processes used in LED manufacturing, as well as for compound semiconductor manufacturing using III-V materials in gate stacks.
This contract calls for IQE to supply all MBE along with most of RFMD's metalorganic vapour phase epitaxy (MOCVD) wafer requirements under a discounted pricing arrangement.
With the full-scale introduction of MOCVD (Metalorganic Chemical Vapor Deposition) used in technology for the miniaturization of next-generation DRAM, the Company aims to commercialize the material in 2012.
A magnesium-doped gallium nitride film was grown epidemically on a sapphire substrate by metalorganic chemical vapor deposition, and was used to form a p-n junction with the zinc oxide wire.