Organometallic compounds, definition

It might be mentioned that matters are much simpler for organometallic compounds with less-polar bonds. Thus Et2Hg and EtHgCl are both definite compounds, the former is a liquid and the latter is a solid. Organocalcium reagents are also known, and they are formed from alkyl halides via a single electron transfer (SET) mechanism with free-radical intermediates. "... 

The second edition of the well-known Red Book, the definitive recommendations of the lUPAC Commission on Nomenclature of Inorganic Chemistry, appeared in Pure Appl. Chem., 28, 1-110 (1971). It is also available separately as a hard-bound reprint. In this edition, the rules for naming organometallic compounds have been completely revised and extended, with introduction of the rj nomenclature for organic ligands. 

In this review, emphasis will be placed first on definitive proof of structure for compounds of main group organometallic compounds that contain the electron-deficient or multicentered bonds described. Evidence for the occurrence of these systems in both liquid an gaseous states also will be given. Finally, this structural information will be used to elucidate the bonding in the molecules. 

In the most general sense, any anion radical produced by reduction with a metal, or by electrolytic reduction in the presence of a metallic counterion could be considered an organometallic anion radical. Any review based on such a definition would be monumental. To achieve a manageable volume of material, with a content suitable to the context of this series, we have limited this chapter to anion radicals produced from organometallic compounds. Anion radicals for which the metal is present solely as the reducing agent or counterion have, for the most part, been excluded. 

It might be mentioned that matters are much simpler for organometallic compounds with less-polar bonds. Thus Et2Hg and EtHgCI are both definite compounds, the former a liquid and the latter a solid. 

In all cases the nomenclature adhered to is that used in the original memoirs, any alteration of which must be undertaken by an International Committee. For an author to make such alterations would merely mean that another set of names had been added to those already in existence, and would tend to add to the present confusion. The author, as in Volume II., again appeals to Chemical Societies to secure some definite standard nomenclature for organometallic compounds in general. 

How is carbon involved in defining what an organometallic compound is How is electronegativity involved in this definition How does an organometalloid differ from an organometallic ... 

In principle, all higher lying states can contribute to the Tj substates via SOC, if the corresponding symmetries fit. However, many of these SOC routes contribute little and can be neglected relative to a few dominating spin-orbit interactions. We will describe fundamentals of the coupling routes from a theoretical point of view and discuss requirements for efficient SOC in organometallic compounds. To make this chapter understandable for the non-specialist, we will start with definitions, which are necessary to fix notations. This will be followed by some relations between orbitals and states. 

This review presents a perspective of the important structural and synthetic studies reported in 2008. The strict definition of an organometallic compound as one containing at least one C-metal bond or contact has been used throughout the literature survey. As with previous years this review is not intended to be comprehensive, although it is based on a comprehensive search. Individual topics are highlighted in bold in the text in order to facilitate rapid access to a particular area of the literature. Research in 2008 on Group 2 and 12 organometallics was dominated by structural studies of novel types of compounds. This is reflected in the focus of the review for this year. 

Is tetramethyldiarsine an organometallic compound By definition, arsenic is a so-called metalloid or semi-metal , not a metal, and thus organoarsenic compounds like the organic compounds of boron or silicon are not per se organometallics. There is no doubt that the preparation of tetramethyldiarsine and the elucidation of its structure may in retrospect be linked to the development of organometallic chemistry, but it would be far beyond the scope of this book, if the chemistry of the organic compounds of the metalloids in its entirety was discussed. 

Definition A reaction whereby an alkyl group is transferred from an organometallic compound to an organic compound containing an (activated) allyl group. 

Since the analyte is often present in quite a complex matrix comprising other elements or substances that may or may not interfere with any projected method of determination, and may indeed be quite a minor constituent of the whole sample, these considerations will effectively dominate the working details of any analytical procedure. There can therefore be no case for prescribing a single definitive method for (say) nickel that would be universally applicable to its determination in alloys see Alloys), organometallic compounds see Organometallic Complexes), inorganic salts see Ionic Bonds), or coordination compounds see Coordination Complexes), to its presence as a trace constituent see Trace Element) in maize or other plant products, or in natural waters or effluents. 

Coordination compounds, as the term is usually used in inorganic chemistry, include compounds composed of a metal atom or ion and one or more ligands (atoms, ions, or molecules) that formally donate electrons to the metal. This definition includes compounds with metal-carbon bonds, called organometallic compounds, which are described in Chapters 13 to 15. 

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