| Popis: |
Publisher Summary This chapter focuses on some recent developments in the structural chemistry of organo-transition metal complexes. The growth in activity, over the last decade, in the general area of organometallic chemistry of transition metal ions is due, to a considerable extent, to the discovery and characterization of ferrocene. The oxidation state of the metal differs by +2 in the structures (I) and (11) but it must be recognized that this is simply a formalism and should not be interpreted literally any more than one understands the situation in ferrocene in which the iron is given an oxidation state of zero or +2 depending on whether the ligand is regarded as an anion or a radical. According to a molecular orbital theory of the electron distribution in a cyclic ligand, the possible role of structure (11) may be measured by the atom-electron localization energy. The formation of the exo-substituted ring may be assumed to be the result of the steric shielding of the inner side of the ring. Structural analyses have also been completed of the endo- and exo-ethoxy isomers of dimeric ethoxytetraphenylcyclobutenylpalladium chloride. |
