Ruthenium bond strengths

In Table 2.28, the activation parameters observed for the reaction of Os3(CO)io(NCMe) with PPha as well as those obtained for substitution reactions of the trimetal dodecacarbonyls of iron, osmium, and ruthenium are shown. The relatively high activation enthalpies and positive AS values observed in this Table agree with the dissociative mechanism described above. The features in Table 2.28 also reflect the much greater liability of Os3(CO)ii(NCMe) compared with Os3(CO)i2. This probably arises from a weaker bond strength of osmium with acetonitrile than with carbon monoxide. 

Although none of these metals form bulk nitrides, the transition metal-nitrogen bond energies are still significant. For ruthenium the surface bond strength (566 kJ mol" ) is not markedly lower than on iron (585 kJ mol" ) (Table 9.2) and even the inactive metals such as palladium have bond strengths of around... 

The bond dissociation energy of fluoromethane is 115 kcal mol , which is much higher than the other halides (C-Cl, C-Br and C-1, respectively 84, 72 and 58 kcal mol ) [6], Due to its strength, the carbon-fluorine (C-F) bond is one of the most challenging bonds to activate [7], A variety of C-F bond activation reactions have been carried out with different organometallic complexes [8], Among them, nickel [9] and ruthenium complexes have proven to proceed selectively under mild conditions [10],... 

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