Organometallic compounds and metals

A review28 describes compounds of the Pt-group metals including halide, oxide, sulfide, coordination compounds, organometallic compounds, and metal cluster compounds. 

The exploitation of atomic-absorption spectrophotometry for monitoring HPLC column effluents has been recently examined by Funasaka et al. [46]. An eluent-vaporizing system was designed which introduced the effluent into the atomic-absorption unit. The limit of detection of compounds such as ethylmercury chloride was ca. 10 ng compared to 30 jug for a UV detector at 210 nm. The extreme selectivity of atomic absorption could make this technique of great value for the analysis of trace amounts of organometallic compounds and metal chelates. 

The C-H transformation in the synthesis of fine chemicals can be separated in reactions employing catalysis by organometallic compounds and metal-free synthesis. Organometallic catalyzed functionalization is usually performed in liquid or gas/liquid reactions whereas the metal-free synthesis of fine chemicals often occurs as a gas-phase reaction. 

Thiocyanate — Thiocyanate (SCN") - anions can be found in industrial wastewaters, pesticide residues, and organism metabolites. They can be determined by - ion-selective electrodes based on a variety of carriers such as organometallic compounds and metal-loporphyrin derivatives. Also, SCN- forms - complexes with metal -> ions (e.g., Ag(SCN)y) and influences the responses of metal ions in -> cyclic voltammetry. 

Preparative Methods include reduction of metal compound in the presence of the ligand, reaction with a methods main-group organometallic compound, and metal vapor synthesis. 

Metal-containing polymers can be synthesized by the vapor deposition polymerization of various monomer systems including organometallic compounds and metal-monomer co-condensates. Such co-condensates are produced by simultaneous or layer-by-layer deposition of metal and monomer vapors on substrate plates at low temperatures (usually, 77 K). Polymerization can proceed in different ways. Some metal-monomer systems polymerize during cocondensation (Ge and Sn with acetylene [11], Mg with CN-substituted p-xylylene [12]), most probably due to heat released at condensation. In references 13-16, co-condensates of metals (Pd, Ag, Au, etc.) and vinyl monomers... 

Such bases can be alkali metals, metal hydrides, organometallic compounds, and metal amides. The initiation step of ring-opening amidation can be shown as follows ... 

Among the most powerful tools in the synthetic organic chemists arsenal are organometallic compounds and metal-mediated transformations. The literature involving organometallic intermediates has literally exploded in the past 30 years, and the rate of publication in this area continues to accelerate. While many transformations involve heterogeneous conditions (metal-solution interface), the majority of these reactions involve discrete organometallic species. 

In recent years this simple picture has been completely transformed and it is now recognized that the alkali metals have a rich and extremely varied coordination chemistry which frequently transcends even that of the transition metals. The efflorescence is due to several factors such as the emerging molecular chemistry of lithium in particular, the imaginative use of bulky ligands, the burgeoning numbers of metal amides, alkoxides, enolates and organometallic compounds, and the exploitation of multidentate... 

Organometallic compounds and inorganic salts (metallic compounds). 

Pt also have the same metallic valence, 5.78 or 6. Then in 1977 I reconsidered this question (17) with consideration of the observed enneacovalence of transition metals in some of their organometallic compounds and concluded that the metallic valence could become as large as 8.3 for Ru-Rh and Os-Ir alloys. This conclusion was reached by an argument based on the observed bond lengths that I now believe to have been misleading. 

V. A New General Synthesis for Trifluoromethyl Organometallic Compounds and Other Sigma-Bonded Metal Compounds Based on Metal Vapor as a Reagent... 

In contrast to 12-32, the reaction between an organometallic compound and a metal... 

Effect of metals, organometallic compounds and strong bases... 

Reacts with many metals to give hydrogen, sometimes violently. With non-metals pyrophoric hydrides may result. Frequently initiates explosive reactions between other substances. Violent reactions with many non-metal and some metal halides and oxyhalides, also with many organometallic compounds. Many metal nonmetal-lides produce toxic, flammable or pyrophoric gases on contact with diprotium monoxide. 

Synthesis with sacrificial electrodes is employed as a direct method in several other preparations of organometallic compounds and complexes. 3-Hydroxy-2-methyl-4-pyrone derivatives of Sn 1 (and of Zn, Cu, In and Cd as well) were prepared using the metal as an anode. The low oxidation state Sn(II) compound is obtained by direct electrolysis134. 

Pierce-Smith converter, 16 145 Piezochromic materials, 6 606-614 22 708t coordination compounds and metal cluster compounds, 6 610-611 organic molecules in crystals and polymer films, 6 607-610 organometallic complexes of Cu(II),... 

Pilcher, G. Thermochemistry of organometallic compounds containing metal-carbon linkages. MTP Review of Science. Series 2. Physical chemistry, Vol. 10. Chapter 2. 1975, p. 45 Cox, J. D., Pilcher, G. Thermochemistry of organic and organometallic compounds. London Academic Press 1970... 

Observed concentration factors for a range of organometallic compounds and the corresponding metal ions in different types of water are tabulated in Table 15.1. Where the concentration factor is appreciably greater than unity the dissolved phase shows a tendency to be adsorbed by the sediment. 

Fig. 15.1 Concentration factor of organometallic compounds and corresponding inorganic metal ions in various matrices. A Organometallic compounds. B Inorganic metal ions Source Own files... 

In many cases, during the impregnahon a surface reaction between the organometallic compound and the surface takes place. The pretreatment of the support can be used to define the distribution of anchorage centers on the surface, and a homogeneous distribution of metal carbonyl surface species can be achieved. 

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