Volatile organometallic compound

A third method makes use of hydrides of group V elements together with volatile organometallic compounds of group III elements such as trimethylgallium and trimethylaluminium. 

This means that in the decays shown in equation 14 no complete rupture of all chemical bonds with Pb and with Bi occurred and the production of volatile organometallic compounds of RaE, Bi Mcj, and of PoMe2 took place according to equation 15. 

Ugo R, Dossi C, Psaro R (1996) Molecular metal carbonyl clusters and volatile organometallic compounds for tailored mono and bimetallic heterogeneous catalysts. 1 Mol Catal A 107 13... 

Natural particles suspended in the air can be transported to regions far from their sources. This is important for transporting many metals and metalloids in the ecosystem. A few metals and metalloids, most notably Hg, As, and Se, can exist not only in the solid and liquid phases but also as gases in ambient environments. The loss of Hg from the aqueous phase can result from reduction of Hg " " to Hg and alkylation to form methyl- or dimethylmercury. Through microbial activity, the methylated forms can be converted to Hg, which is more volatile and less toxic. Microbial mediation can also transform several other trace elements (e.g., As, Se) to organometallic compounds (Gadd, 1993). These volatile organometallic compounds can dominate the transport of these trace elements in local environments. However, bacterial mediation of alkylation of metals such as Hg is influenced substantially by Hg speciation. Mineral colloids vary in their ability to affect the bioavailability and methylation of Hg(II) in aqueous systems... 

Lead forms a wide range of compounds where the metal is present in either of two oxidation states — Pb and Pb. These compounds range from oxides and simple salts to volatile organometallic compounds such as lead tetraethyl used in petrol. In salts formed by the actions of acids (e.g. acetic and nitric acids), the metal is in the lower of the two oxidation states (Pb ), and the compounds are ionic in character. In the numerous compounds... 

Sonochemical method is valid for a large number of nanostructured and amorphous metals, alloys and refractory compounds [253-257]. Volatile organometallic compounds decompose inside the collapsing bubbles and the metal atoms are collected in the aggregates, agglomerates and pellets. 

One other diffraction method that has proved useful for sufficiently volatile organometallic compounds is electron diffraction. In this technique the organometallic compound is introduced into a vacuum chamber through a nozzle, and an electron beam is passed through the stream of molecules. The resulting diffraction pattern contains much less information than does an X-ray diffraction pattern, but by making simple assumptions about the structure of the molecule, valuable data can be obtained. A useful feature of the results is that they refer to the molecule in an isolated state in a vacuum, so solvation or crystal packing effects are absent. 

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