Metallocenes, mean bond dissociation

Table 9. Valence m.o. electron configuration Ofg e"g e%g, enthalpy of sublimation, AHSU, and standard enthalpy of formation, (AHf, g), of metallocenes. Mean bond dissociation enthalpy, D (M-Cp) (Refs.68 69 ) and (Metal-cyclopentadienyl ring) bond length, r(M-Cp). (Ref.72 ).

Bis(arene)complexes are, like the metallocenes, endothermic compounds. The standard enthalpy of formation of bis(benzene)chromium from the elements is 141.4kJmor Nevertheless they do often exhibi a fair degree of thermal stability. The mean bond dissociation energies D(M-arene) in Cr(CgH )2, Mo(CgHj2 and W(C H5Me)2 defined according to... 

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