Organotransition metal oxidation state

To summarize, the special bonding characteristics of 7r-acceptor ligands in organotransition metal compounds enable these complexes to coordinate small molecules such as ethylene, CO, and H2 and also provide an electronic buffer system to facilitate changes of metal oxidation state and coordination... 

Organotransition metal oxides or organo 0x0 complexes see Oxo Complex) represent a fast expanding area for early transition metals of groups 4 to 7, due to their relationship with catalytic species formed on the surface of oxides under catalytic conditions. Furthermore, they may also supply a convenient set of volatile starting materials for application in Metal-Organic Chemical Vapor Deposition and related techniques of solid-state and surface chemistry. Most of... 

The mechanistic basis to radical reactivity of organotransition metal compounds is still not very well developed. Mechanisms very often remain speculative, since the information about involved intermediates is scarce. Mechanistic information can be gathered by using physical methods, such as ESR spectroscopy. Changes in the oxidation state of metal complexes indicating SET, paramagnetic metal centers or the radicals themselves, provided their lifetime allows it, can be detected (selected reviews [73-75]). CIDNP measurements can also provide valuable information, but were rarely used in the past [76-78]. 

The electrochemistry of large numbers of organic species is well established, and the occurrence of multiple oxidation states is commonplace for transition metal compounds. By comparison, the redox reactions of organotransition metal complexes are relatively unexplored. 

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