Organometallic complexes paramagnetic complex

In addition to substitution of the carbonyl groups, changes in the cyclopentadienyl ring have also been extensively studied. The use of pentamethylcyclopentadiene led to formation of some of the first organometallic multiply bonded complexes as discussed in Section 4.8. The tris(pyrazolyl)borate ion (Tp , see Tris(pyrazolyl)borates) is a Cp analog." It reacts with Mo(CO)6 to yield the TpMo(CO)3 anion. Oxidation yields the paramagnetic radical that shows no tendency to form a single metal-metal bond. Decarbonylation yields a triply bonded stracture. These reactions are summarized in equation (16). 

Electronic Structure of Solids Magnetism of Transition Metal Ions Paramagnetic Organometallic Complexes. 

In other cases, non-chain radical reactions have been suggested see Paramagnetic Organometallic Complexes). 

Bonding Energetics of Organometallic Compounds Electron Transfer in Coordination Compounds Paramagnetic Organometallic Complexes Structure Property Maps for Inorganic Solids. 

Organometallic osmium(IV) complexes are readily characterized by NMR spectroscopy because they are either diamaguetic or, depeudiug ou their symmetry, paramagnetic but with sharp NMR siguals. Unlike most Os(IV), six-coordinate porphyrin complexes, the dialkylporphyrin complex of osmium(IV) Os(TPP)(CH2SiMc4)2 is diamagnetic... 

This article is divided into several parts, with long-lived organometallic complexes as the primary focus. Shortlived systems (see Short-lived Intermediates), as well as techniques used to characterize paramagnetic systems, will also be discussed. In addition, potential applications of open-shell organometallic complexes, especially for catalysis and magnetic materials, will also be presented. 

Modem transition metal organometallic chemistry can be said to have been invigorated by the discovery and subsequent bonding description of ferrocene (see Ferrocene) by Wilkinson and Fischer in 1951. As predicted by MO theory, all of the neutral first-row metallocenes (see Metallocene Complexes) (V Ni) are paramagnetic, with the exception of ferrocene. Metallocenes probably represent the most studied of all paramagnetic organometallic complexes. 

D. R. Tyler and A. Avery, Paramagnetic Organometallic Complexes, Encyclopedia of Inorganic Chemistry , Wiley, Chichester, 1994, p. 3055. 

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