Nickel carbonyl, Ni

Nickel Purification. The Mond process for nickel purification is based on the formation of volatile nickel carbonyl, Ni(CO)4, which is stable... 

Nickel carbonyl, Ni(CO) , boils at 43°C, and uses the sp1 orbitals of Ni for bonding. Give reasons to justify the following ... 

Many metal carbonyls are available commercially. However, in some cases, the CVD investigator may find it more expedient (and sometimes cheaper) to produce them in-house. This is particularly true of the only two carbonyls that can be obtained by the direct reaction of the metal with CO (and consequently easy to synthesize), i.e., nickel carbonyl, Ni(CO)4, and iron carbonyl, Fe(CO)5. 

Another method for the conversion of alkyl halides to carboxylic esters is treatment of a halide wifh nickel carbonyl, Ni(CO)4, in the presence of an alcohol... 

The early synthetic processes using organonickel compounds involved the coupling of allylic halides, which react with nickel carbonyl, Ni(CO)4, to give TT-allyl complexes. These complexes react with a variety of halides to give coupling products.255... 

Nickel carbonyl (Ni(CO)4) is a volatile, colorless liquid readily formed when nickel reacts with carbon monoxide it boils at 43°C and decomposes at more than 50°C. This compound is unstable in air and is usually not measurable after 30 min (NRCC 1981 Norseth 1986 USPHS 1993). The intact molecule is absorbed by the lung (USEPA 1980) and is insoluble in water but soluble in most organic solvents (WHO 1991). 

Carbonyl. The group. —C=0, characteristically found in aldehydes, ketones and organic acids. Also the general name given to compounds containing the CO group such as nickel carbonyl, Ni(CO)4. 

Nickel is a silver-white, lustrous, hard, malleable, ductile, ferromagnetic metal that is relatively resistant to corrosion and is a fair conductor of heat and electricity. Nickel is a ubiquitous trace metal that occurs in soil, water, air, and in the biosphere. The average content in the earth s crust is about 0.008%. Nickel ore deposits are accumulations of nickel sulfide minerals (mostly pentlandite) and laterites. Nickel exists in five major forms elemental nickel and its alloys inorganic, water-soluble compounds (e.g., nickel chloride, nickel sulfate, and nickel nitrate) inorganic, water-insoluble compounds (e.g., nickel carbonate, nickel sulfide, and nickel oxide) organic, water-insoluble compounds and nickel carbonyl Ni(CO). ... 

This conclusion is rigorous for the nickel carbonyls Ni(CO)nL4 n ( = 0—2). Results for the molybdenum series are internally consistent but not directly comparable. They depend on the use of Cotton-Kraihanzel rather than exact parameters, and involve comparison of t (where mutually (fans CO groups exist) with 2c (where they do not). 

Antidetonanti, in Ital and Antidetonants, in Fr). Substances such as lead tetraethyl Pb(C2Hs )4 tin tetraethyl Sn(CjHs)4, ferro-earbonyl Fe(CO)5, nickel carbonyl Ni(C0)4, aniline, etc possess the property of preventing knock in internal combustion engines and for this reason are also called "antiknock substances. For their description see Refs 3,5,7 8... 

There have been several ab imto LCAO MO SCF calculations on tetrahedral transition-metal complexes for example, see the work of Hillier and Saunders (Molecular physics 22, 1025 (1970)), and Demuynck and Veillard (Theoretica chimica acta 28, 241 (1973)) on nickel carbonyl Ni(OO). ... 

In the Mond process for purifying nickel, the volatile nickel carbonyl, Ni(CO)4, is produced by the reaction below. How much CO is used up per kilogram of nickel ... 

The other major toxic effect of nickel is nickel dermatitis, an allergic contact dermatitis arising from contact with nickel metal. About 5 to 10% of people are susceptible to this disorder. It almost always occurs as the result of wearing nickel jewelry in contact with skin. Nickel carbonyl, Ni(CO)4, is an extremely toxic nickel compound discussed further in Chapter 12. 

One step in the industrial refining of nickel is the decomposition of nickel carbonyl (Ni(CO)4) into nickel and carbon monoxide. In a laboratory reaction, 25.0 g nickel carbonyl yielded 5.34 g nickel. 

In 1890, Ludwig Mond, Carl Langer, and Friedrich Quincke (24) announced the discovery of nickel carbonyl, Ni(CO)4. The unusual properties of this carbonyl stimulated a great deal of interest and investigation into other carbonyls and in 1908, Mond, Hirtz, and Cowap (25) described cobalt carbonyl. They found (26) by cryoscopic measure-... 

The trihalides of phosphorus and antimony have been shown to be slightly and quite selectively basic, being rather similar in coordinating action to carbon monoxide (p. 156). Compounds analogous to nickel carbonyl, Ni(CO)4, may be prepared by treating the carbonyl with an excess of the appropriate trihalide ... 

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