Metallic bonding overview

The intermolecular carbometallation reaction catalyzed by transition metals from groups 8 to 11 has been fully investigated during the last decade. Many examples have been reported in the literature concerning different metals in order to create C-C bonds. Overview of this powerful method will be given as exhaustively as possible and carbometallation reactions will be classified according to unsaturated systems. 

Hafnium complexes with bis(cyclopentadienyl)s, 4, 731 in carbometallations, overview, 10, 255 in C-C bond formation, 10, 424 in ethylene polymerization, 4, 1139 for isotactic polypropylene, 4, 1126 metal-metal bonds, 4, 755 mixed-valence compounds, 4, 755 with pyridyl amines, for olefin polymerization, 4, 1094 in Ru-Os heterodinuclear compounds, 6, 1046 with silicon, 3, 515... 

Main group element clusters without ligands belong to another class of cluster compounds and can also be classified into discrete cluster ions and solid-state clusters. Some of their bonding properties are similar to those of the transition-metal clusters, and in addition to being important in their own right, information obtained from compounds such as Zintl phases is very useful for an overview of metal-metal bonding. 

Since these early developments, a wide variety of organometallic platinum(II) and palladium(II) compounds possessing dative metal-metal bonds have been prepared with diverse ligands and acceptor fragments. This chapter provides an overview of the known stmctural motifs with selected examples and discusses the reactivity of some of these bimetallic species and their possible involvement as intermediates in catalytic systems based on group 10 metals. 

Transition metal bonds to Group 13 elements have been the subject of several extensive review artides [17,183-185,199-201]. In this section, a brief overview of the key routes employed to access such systems will be presented, together with a discussion of the nature of the metal-metal bonding. 

Despite the fact that compounds that feature metal-metal bonds have been known for many decades, interesting discoveries continue to be made at a rapid pace. The purpose of this volume is to highlight some of these recent advances in both main group and transition metal chemistry, and an overview of the topics covered is provided here. 

This review presents an overview of the mechanistic aspects of polymer photodegradation, with a primary emphasis on a special class of photodegradable polymer that has metal-metal bonds along the polymer backbones. Throughout the review, the major emphasis is on degradation pathways and the parameters that control the rates of degradation. 

Baker, A.A., Bonded Composite Repair of Metallic Aircraft Components — Overview of Australian Activities, AGARD (Advisory Group for Aerospace Research and Development) Conference of Composite Repair of Military Aircraft Structures, 3-5 October 1994, Seville. 

Ozmen (2004, especially for chemical bonding) and Coll und Treagust (2003, chemistiy of metals) can help to develop a first overview. Numerous authors (e g. Pfund, 1975 Schldpke, 1991 Griffith and Preston, 1992 Mas et al., 1987) describe parallels between students conceptions and historical scientific ideas. Schldpke (1991), for example, points out similarities between students conceptions concerning properties of matter and ideas in alchemist thinking. Lee, Eichinger, Anderson, Berkheimer, and Blakeslee (1993) mentions semblances between the ideas of Aristotle and students conceptions about general aspects of the particulate nature of matter and the horror vacui . 

In this chapter, we survey the diversity of transition metals, beginning with an overview. Then we describe the stmcture and bonding in transition metal complexes. We describe metallurgy, the processes by which pure metals are extracted from mineral ores. The chapter ends with a presentation of some properties of transition metals and their biological roles. 

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