摘要：

A construction of the molecular orbitals of a bent bis($-cyclopentadienyl)M fragment, CpzM, M = a transition metal, serves as a starting point for a general account of the electronic structure of CpzML, molecules, n = 1-3. The fol- lowing problems are analyzed: the geometry of CpzML, as a function of the d electron configuration; bonding with x accep- tor and donor ligands, emphasizing orbital interactions with conformational consequences such as olefin and carbene orienta- tion and dithiolene bending; distortions of the Cp2M moiety; insertion reactions of coordinated olefins; carbonyl insertion re- actions; oxidative coupling; allyl and tetrahydroborate complexes; triscyclopentadienyl complexes.

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